Showing papers on "Optical microcavity published in 2018"

Advances in optoplasmonic sensors - combining optical nano/microcavities and photonic crystals with plasmonic nanostructures and nanoparticles

Abstract: Abstract Nanophotonic device building blocks, such as optical nano/microcavities and plasmonic nanostructures, lie at the forefront of sensing and spectrometry of trace biological and chemical substances. A new class of nanophotonic architecture has emerged by combining optically resonant dielectric nano/microcavities with plasmonically resonant metal nanostructures to enable detection at the nanoscale with extraordinary sensitivity. Initial demonstrations include single-molecule detection and even single-ion sensing. The coupled photonic-plasmonic resonator system promises a leap forward in the nanoscale analysis of physical, chemical, and biological entities. These optoplasmonic sensor structures could be the centrepiece of miniaturised analytical laboratories, on a chip, with detection capabilities that are beyond the current state of the art. In this paper, we review this burgeoning field of optoplasmonic biosensors. We first focus on the state of the art in nanoplasmonic sensor structures, high quality factor optical microcavities, and photonic crystals separately before proceeding to an outline of the most recent advances in hybrid sensor systems. We discuss the physics of this modality in brief and each of its underlying parts, then the prospects as well as challenges when integrating dielectric nano/microcavities with metal nanostructures. In Section 5, we hint to possible future applications of optoplasmonic sensing platforms which offer many degrees of freedom towards biomedical diagnostics at the level of single molecules.

Valley coherent exciton-polaritons in a monolayer semiconductor

Abstract: Two-dimensional transition metal dichalcogenides (TMDs) provide a unique possibility to generate and read-out excitonic valley coherence using linearly polarized light, opening the way to valley information transfer between distant systems. However, these excitons have short lifetimes (ps) and efficiently lose their valley coherence via the electron-hole exchange interaction. Here, we show that control of these processes can be gained by embedding a monolayer of WSe2 in an optical microcavity, forming part-light-part-matter exciton-polaritons. We demonstrate optical initialization of valley coherent polariton populations, exhibiting luminescence with a linear polarization degree up to 3 times higher than displayed by bare excitons. We utilize an external magnetic field alongside selective exciton-cavity-mode detuning to control the polariton valley pseudospin vector rotation, which reaches 45° at B = 8 T. This work provides unique insight into the decoherence mechanisms in TMDs and demonstrates the potential for engineering the valley pseudospin dynamics in monolayer semiconductors embedded in photonic structures.

Cavity-enhanced spectroscopy of a few-ion ensemble in Eu3+:Y2O3

Abstract: We report on the coupling of the emission from a single europium-doped nanocrystal to a fiber-based microcavity under cryogenic conditions. As a first step, we study the properties of nanocrystals that are relevant for cavity experiments and show that embedding them in a dielectric thin film can significantly reduce scattering loss and increase the light-matter coupling strength for dopant ions. The latter is supported by the observation of a fluorescence lifetime reduction, which is explained by an increased local field strength. We then couple an isolated nanocrystal to an optical microcavity, determine its size and ion number, and perform cavity-enhanced spectroscopy by resonantly coupling a cavity mode to a selected transition. We measure the inhomogeneous linewidth of the coherent D-5(0)-F-7(0) transition and find a value that agrees with the linewidth in bulk crystals, evidencing a high crystal quality. We detect the fluorescence from an ensemble of few ions in the regime of power broadening and observe an increased fluorescence rate consistent with Purcell enhancement. The results represent an important step towards the efficient readout of single rare earth ions with excellent optical and spin coherence properties, which is promising for applications in quantum communication and distributed quantum computation.

Parity-time symmetry in optical microcavity systems

Abstract: Canonical quantum mechanics postulates Hermitian Hamiltonians to ensure real eigenvalues. Counterintuitively, a non-Hermitian Hamiltonian, satisfying combined parity-time (PT) symmetry, could display entirely real spectra above some phase-transition threshold. Such a counterintuitive discovery has aroused extensive theoretical interest in extending canonical quantum theory by including non-Hermitian but PT-symmetric operators in the last two decades. Despite much fundamental theoretical success in the development of PT-symmetric quantum mechanics, an experimental observation of pseudo-Hermiticity remains elusive as these systems with a complex potential seem absent in Nature. But nevertheless, the notion of PT symmetry has highly survived in many other branches of physics including optics, photonics, AMO physics, acoustics, electronic circuits, material science over the past ten years, and others, where a judicious balance of gain and loss constitutes a PT-symmetric system. Here, although we concentrate upon reviewing recent progress on PT symmetry in optical microcavity systems, we also wish to present some new results that may help to accelerate the research in the area. Such compound photonic structures with gain and loss provide a powerful platform for testing various theoretical proposals on PT symmetry, and initiate new possibilities for shaping optical beams and pulses beyond conservative structures. Throughout this article there is an effort to clearly present the physical aspects of PT-symmetry in optical microcavity systems, but mathematical formulations are reduced to the indispensable ones. Readers who prefer strict mathematical treatments should resort to the extensive list of references. Despite the rapid progress on the subject, new ideas and applications of PT symmetry using optical microcavities are still expected in the future.

Room-Temperature Exciton-Polariton Condensation in a Tunable Zero-Dimensional Microcavity

Abstract: We create exciton-polaritons in a zero-dimensional (0D) microcavity filled with organic ladder-type conjugated polymer in the strong light–matter interaction regime Photonic confinement at wavelength scale is realized in the longitudinal direction by two dielectric Bragg mirrors and laterally by a submicron Gaussian-shaped defect The cavity is separated into two parts, allowing nanometer position control and enabling tuning of the exciton and photon fractions of the polariton wave function Polariton condensation is achieved with nonresonant picosecond optical excitation under ambient conditions and evidenced by a threshold behavior with a nonlinear increase in the emission intensity, line narrowing, and a blue shift in the emission peak Furthermore, angular emission spectra show that condensation occurs in the ground state of the 0D cavity, and first-order coherence measurements reveal the coherent nature These experiments open the door for polariton quantum fluids in complex external potentials at r

Vertical Cavity Biexciton Lasing in 2D Dodecylammonium Lead Iodide Perovskites

Abstract: © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Layered Ruddlesden-Popper-type (2D) metal-halide perovskites exhibit markedly increased exciton binding energies, exceeding 150 meV, compared to their 3D counterparts. Many-body physics, enabled by Coulomb interactions, plays a strong role and raises the biexciton binding energy to 50 meV. Here, photoluminescence at a range of temperatures and carrier concentrations in thin films of the layered perovskite material (C12H25NH3)2PbI4 is reported. Biexcitons are directly observed up to a sample temperature of 225 K. An optical microcavity (comprising a distributed Bragg reflector and a metal mirror), with photonic resonances tuned near to the biexciton energy, is constructed. Optically-pumped biexciton lasing up to 125 K, with a threshold peak excitation density of 5.6 × 1018 cm−3, is observed. The demonstration of biexciton lasing above liquid nitrogen temperatures is a crucial step for the application of layered perovskites in photonic applications.

Parity-time symmetry in optical microcavity systems

Abstract: Canonical quantum mechanics postulates Hermitian Hamiltonians to ensure real eigenvalues. Counterintuitively, a non-Hermitian Hamiltonian, satisfying combined parity-time (PT) symmetry, could display entirely real spectra above some phase-transition threshold. Such a counterintuitive discovery has aroused extensive theoretical interest in extending canonical quantum theory by including non-Hermitian but PT-symmetric operators in the last two decades. Despite much fundamental theoretical success in the development of PT-symmetric quantum mechanics, an experimental observation of pseudo-Hermiticity remains elusive as these systems with a complex potential seem absent in Nature. But nevertheless, the notion of PT symmetry has highly survived in many other branches of physics including optics, photonics, AMO physics, acoustics, electronic circuits, material science over the past ten years, and others, where a judicious balance of gain and loss constitutes a PT-symmetric system. Here, although we concentrate upon reviewing recent progress on PT symmetry in optical microcavity systems, we also wish to present some new results that may help to accelerate the research in the area. Such compound photonic structures with gain and loss provide a powerful platform for testing various theoretical proposals on PT symmetry, and initiate new possibilities for shaping optical beams and pulses beyond conservative structures. Throughout this article there is an effort to clearly present the physical aspects of PT-symmetry in optical microcavity systems, but mathematical formulations are reduced to the indispensable ones. Readers who prefer strict mathematical treatments should resort to the extensive list of references. Despite the rapid progress on the subject, new ideas and applications of PT symmetry using optical microcavities are still expected in the future.

Optimal third-harmonic generation in an optical microcavity with χ (2) and χ (3) nonlinearities

Abstract: Third-harmonic generation can be realized via both χ(3) and cascaded χ(2) nonlinear processes in a triply-resonant microcavity. It is still unknown how these processes interfere with each other and the optimization of the conversion efficiency still remains as a question. In this work, the interplay between the direct third-harmonic generation and the cascaded process combining of the second-harmonic generation and the sum-frequency generation are investigated. It is found that the interference effect between these two processes can be used to improve the conversion efficiency. By optimizing the cavity resonance and the external coupling conditions, the saturation of the nonlinear conversion is mitigated and the third-harmonic conversion efficiency is increased. A design rule is provided for achieving efficient third-harmonic generation in an optical microcavity, which can be generalized further to the high-order harmonic generations.

Light-Confining Nanoporous Anodic Alumina Microcavities by Apodized Stepwise Pulse Anodization

Abstract: This study presents an innovative approach to fabricate nanoporous anodic alumina optical microcavities (NAA-μCVs) with enhanced quality factor and versatile optical properties. An apodization strategy using a logarithmic negative function is applied to a stepwise pulse anodization process in order to engineer the effective medium of NAA so that it confines light efficiently. The architecture of these light-trapping photonic crystals is composed of two highly reflecting mirrors with an asymmetrically apodized effective medium. Various anodization parameters such as the anodization time, anodization period, current density offset, and pore-widening time are systematically modified to assess their effect on the optical properties of NAA-μCVs in terms of the quality factor and position of the resonance band. We demonstrate that this fabrication approach enables the generation of NAA-μCVs with a high quality factor (∼113) and well-resolved and tunable resonance bands across the spectral regions, from UV to ne...

Hybrid-cavity semiconductor lasers with a whispering-gallery cavity for controlling Q factor

Abstract: Hybrid cavities composed of a Fabry-Perot (FP) cavity and awhispering-gallery mode (WGM) microcavity have been proposed anddemonstrated for modulating mode $Q$ factor to realize singlemode and optical bistable lasers. In this article, we report hybrid cavity lasers witha pentagon microcavity and a square microcavity, respectively. Thereflectivity spectra of different microcavities are simulated to selectmicrocavities for hybrid cavities. Mode coupling with mode $Q$ factor enhancement is investigated numerically and experimentally.Stable single mode operations with a high coupling efficiency to a singlemode fiber are realized for a hybrid cavity laser with a square microcavity.Furthermore, optical bistability hybrid lasers are investigated as themicrocavity is unbiased, due to saturable absorption in the microcavity andmode competition, respectively. All-optical flip-flop is demonstrated usingtrigger optical pulses with a width of 100 ps for mode competitionbistability. The stable single mode operation and optical bistability ofhybrid cavity lasers may shed light on the applications for photonicintegrated circuits and optical signal processing.

Enhancement of second-harmonic generation based on the cascaded second- and third-order nonlinear processes in a multimode optical microcavity

Abstract: Optical microcavities are often used to realize enhanced nonlinear optical interactions for highly efficient second-harmonic generation. With increased pump power, the efficiency of nonlinear frequency conversion can be increased further, whereas some other unwanted nonlinear effects will also emerge, leading to complicated dynamics or instability. Here, we study the interplay between cascaded second- and third-order nonlinear processes and investigate their impact on the second-harmonic generation in microcavities. It is found that the nondegenerate optical parametric oscillation (OPO) appears and the presence of a ${\ensuremath{\chi}}^{(3)}$ process can modify the OPO threshold significantly when the multimode cavity is strongly pumped at the fundamental optical mode. One can even break the efficiency limitation of the second-harmonic mode restricted by the OPO by utilizing the interference between the OPO and the four-wave mixing. The present coherent interplay between nonlinear optical processes in the microcavities is conducive to explore new physics in the cavity nonlinear photonics.

Diamond in a Nanopocket: A New Route to a Strong Purcell Effect.

Abstract: Light emission from the color centers in diamonds can be significantly enhanced by their interaction with optical microcavities. In the conventional chip-based hybrid approach, nanodiamonds are placed directly on the surface of microcavity chips created using fabrication-matured material platforms. However, the achievable enhancement due to the Purcell effect is limited because of the evanescent interaction between the electrical field of the cavity and the nanodiamond. Here, we propose and statistically analyze a diamond in a nanopocket structure as a new route to achieve a high enhancement of light emission from the color center in the nanodiamond, placed in an optical microcavity. We demonstrate that by creating a nanopocket within the photonic crystal L3 cavity and placing the nanodiamond in, a significant and a robust control over the local density of states can be obtained. The antinodes of the electric field relocate to the nanosized air gaps within the nanopocket, between the nanodiamond and the m...

Can A Universal Quantum Cloner Be Used to Design an Experimentally Feasible Near-Deterministic CNOT Gate ?

Abstract: We propose a non-deterministic CNOT gate based on a quantum cloner, a quantum switch based on all optical routing of single photon by single photon, a quantum-dot spin in a double-sided optical microcavity with two photonic qubits, delay lines and other linear optical photonic devices. Our CNOT provides a fidelity of 78% with directly useful outputs for a quantum computing circuit and requires no ancillary qubits or electron spin measurements.

Error-heralded generation and self-assisted complete analysis of two-photon hyperentangled Bell states assisted by single-sided quantum-dot-cavity systems

Abstract: Hyperentangled Bell-state analysis (HBSA) is critical for high-capacity quantum communication Here we design two effective schemes for error-heralded deterministic generation and self-assisted complete analysis of hyperentangled Bell states for two-photon systems in both the polarization and spatial-mode degrees of freedom, assisted by single-sided quantum-dot-cavity systems We construct an error-heralded block with a singly charged quantum dot inside a single-sided optical microcavity, two circular polarization beam splitters, one half-wave plate, and one single-photon detector, in which the errors due to imperfect interactions between photons and quantum dot systems can be heralded With this error-heralded block, the fidelity of our two schemes for hyperentangled Bell-state generation and complete HBSA can reach unit one What interesting is that by using the measured spatial-mode state to assist the analysis of the polarization state, our complete HBSA scheme works in a self-assisted way, which greatly simplifies the analysis process and largely relaxes the requirements on nonlinearities These advantages make our schemes much easier to implement experimentally, and have more practical applications in long-distance high-capacity quantum communication

Optimal third-harmonic generation in an optical microcavity with $\chi^{(2)}$ and $\chi^{(3)}$ nonlinearities

Abstract: Third-harmonic generation can be realized via both $\chi^{(3)}$ and cascaded $\chi^{(2)}$ nonlinear processes in a triply-resonant microcavity. It is still unknown how these processes interfere with each other and the optimization of the conversion efficiency still remains as a question. In this work, the interplay between the direct third-harmonic generation and the cascaded process combining of the second-harmonic generation and the sum-frequency generation are investigated. It is found that the interference effect between these two processes can be used to improve the conversion efficiency. By optimizing the cavity resonance and the external coupling conditions, the saturation of the nonlinear conversion is mitigated and the third-harmonic conversion efficiency is increased. A design rule is provided for achieving efficient third-harmonic generation in an optical microcavity, which can be generalized further to the high-order harmonic generations.

Phase Transitions of the Polariton Condensate in 2D Dirac Materials

Abstract: For the quantum well in an optical microcavity, the interplay of the Coulomb interaction and the electron-photon (e-ph) coupling can lead to the hybridizations of the exciton and the cavity photon known as polaritons, which can form the Bose-Einstein condensate above a threshold density. Additional physics due to the nontrivial Berry phase comes into play when the quantum well consists of the gapped two-dimensional Dirac material such as the transition metal dichalcogenide MoS_{2} or WSe_{2}. Specifically, in forming the polariton, the e-ph coupling from the optical selection rule due to the Berry phase can compete against the Coulomb electron-electron (e-e) interaction. We find that this competition gives rise to a rich phase diagram for the polariton condensate involving both topological and symmetry breaking phase transitions, with the former giving rise to the quantum anomalous Hall and the quantum spin Hall phases.

Coherent quantum dynamics of systems with coupling-induced creation pathways

Abstract: Many technologies emerging from quantum information science heavily rely upon the generation and manipulation of entangled quantum states. Here, we propose and demonstrate a new class of quantum interference phenomena that arise when states are created in and coherently converted between the propagating modes of an optical microcavity. The modal coupling introduces several new creation pathways to a nonlinear optical process within the device, which quantum mechanically interfere to drive the system between states in the time domain. The coherent conversion entangles the generated biphoton states between propagation pathways, leading to cyclically evolving path-entanglement and the manifestation of coherent oscillations in second-order temporal correlations. Furthermore, the rich device physics is harnessed to tune properties of the quantum states. In particular, we show that the strength of interference between pathways can be coherently controlled, allowing for manipulation of the degree of entanglement, which can even be entirely quenched. The states can likewise be made to flip-flop between exhibiting initially correlated or uncorrelated behavior. Based upon these observations, a proposal for extending beyond a single device to create exotic multi-photon states is also discussed.

Microfluid detection device and method

Abstract: An embodiment of the invention discloses a microfluid detection device and method. The microfluid detection device comprises a tunable laser arranged at the first end of a conical fiber; the conical fiber is arranged above an echo wall mode optical microcavity; when a microfluid flows through the echo wall mode optical microcavity, the tunable laser inputs first swept laser of variable wavelengthto the conical fiber; the conical fiber couples the first swept laser to the echo wall mode optical microcavity; the echo wall mode optical microcavity resonates laser, meeting the resonance conditions, of the first swept laser and admits transmittance of laser, not meeting the resonance conditions, of the first swept laser; the conical fiber also outputs from its second end, second swept laser that is transmitted through the echo wall mode optical microcavity; the second swept laser carries information that characterizes component changes of the microfluid. The microfluid detection device andmethod can provide real-time online monitoring for microfluid components in very fine channels and may reach very high detection precision.

A Tellurium Oxide Microcavity Resonator Sensor Integrated On-Chip with a Silicon Waveguide.

Abstract: We report on thermal and evanescent field sensing from a tellurium oxide optical microcavity resonator on a silicon photonics platform. The on-chip resonator structure is fabricated using silicon-photonics-compatible processing steps and consists of a silicon-on-insulator waveguide next to a circular trench that is coated in a tellurium oxide film. We characterize the device’s sensitivity by both changing the temperature and coating water over the chip and measuring the corresponding shift in the cavity resonance wavelength for different tellurium oxide film thicknesses. We obtain a thermal sensitivity of up to 47 pm/°C and a limit of detection of 2.2 × 10−3 RIU for a device with an evanescent field sensitivity of 10.6 nm/RIU. These results demonstrate a promising approach to integrating tellurium oxide and other novel microcavity materials into silicon microphotonic circuits for new sensing applications.

Optical Near-Field Metrology

Abstract: Systems and methods are provided which utilize optical microcavity probes to map wafer topography by near-field interactions therebetween in a manner which complies with high volume metrology requirements. The optical microcavity probes detect features on a wafer by shifts in an interference signal between reference radiation and near-field interactions of radiation in the microcavities and wafer features, such as device features and metrology target features. Various illumination and detection configurations provide quick and sensitive signals which are used to enhance optical metrology measurements with respect to their accuracy and sensitivity. The optical microcavity probes may be scanned at a controlled height and position with respect to the wafer and provide information concerning the spatial relations between device and target features.

Generation of large scale GHZ states with the interactions of photons and quantum-dot spins

Abstract: We present a deterministic scheme for generating large scale GHZ states in a cavity-quantum dot system. A singly charged quantum dot is embedded in a double-sided optical microcavity with partially reflective top and bottom mirrors. The GHZ-type Bell spin state can be created and two n-spin GHZ states can be perfectly fused to a 2n-spin GHZ state with the help of n ancilla single-photon pulses. The implementation of the current scheme only depends on the photon detection and its need not to operate multi-qubit gates and multi-qubit measurements. Discussions about the effect of the cavity loss, side leakage and exciton cavity coupling strength for the fidelity of generated states show that the fidelity can remain high enough by controlling system parameters. So the current scheme is simple and feasible in experiment.

On-chip optical microcavity sensor and optical microcavity coupled waveguide sensing device provided with same

Abstract: The invention discloses an on-chip optical microcavity sensor and an optical microcavity coupled waveguide sensing device provided with the same. The on-chip optical microcavity sensor comprises a U-type waveguide and a microcavity coupled inside, wherein two straight arms of the U-type waveguide are coupled with the microcavity respectively to form two coupling points; the waveguide between the two coupling points of the U-type waveguide is a sensing waveguide; the sensing waveguide is connected with the input waveguide of the U-type waveguide through one of the two coupling points and is connected with the output waveguide of the U-type waveguide through the other one of the two coupling points; and the sensing waveguide acts as a first interference arm and interacts with a to-be-measured sensing object; a half cycle part, adjacent to the sensing waveguide, of the microcavity acts as a second interference arm and does not interact with the to-be-measured sensing object. Thus, under adissipative sensing mechanism, the corresponding parameters of the to-be-measured sensing object are acquired according to changes of a resonance mode extinction ratio caused by optical interferencebased on the interference arms, and thus, the technical effects of eliminating constrained detection limit and eliminating near-field interaction constraints can be acquired.

Full decoupling annular micro gyroscope based on optical microcavities and processing method thereof

Abstract: The invention discloses a full decoupling annular micro gyroscope based on optical microcavities and a processing method thereof. The micro gyroscope comprises a cover cap and a wafer from top to bottom. The wafer comprises an upper apparatus layer and a lower substrate layer. The apparatus layer is provided with a plurality of electrodes, a harmonic oscillator, a first optical microcavity, a second optical microcavity, a first light wave guide and a second light wave guide. The electrodes are adjacent to the inner wall of the harmonic oscillator to form a capacitor; the first light wave guideand the second light wave guide are symmetrically distributed on two sides of the harmonic oscillator; the first and second optical microcavities are adjacent to the first light wave guide and the second light wave guide, separately, and the first and second optical microcavities are connected to the harmonic oscillator. By adopting an optical detection scheme, compared with a conventional micro-mechanical and electric gyroscope, the reliability and measuring precision of the gyroscope can reach a higher level.

Quantum chaos in optical microcavities: A broadband application

Abstract: Utilizing quantum chaos, a broadband and efficient coupling scheme has been demonstrated between a fibre and an optical microcavity. This approach may push optical microcavities with chaotic ray dynamics to fulfill their long-anticipated commercial potential.

Phonon-induced dephasing of quantum dot excitons and microcavity-embedded quantum

Abstract: Central to the present work is the interaction between a semiconductor quantum dot (QD) exciton and its phonon environment. In the spectral domain, phonon assisted dephasing of the QD exciton presents as a phonon broadband, which is superimposed upon a narrow zero-phonon line (ZPL). The phonon broadband exhibits a high degree of thermal sensitivity, which we exploit in order to measure the temperature of semiconductor QD samples from their respective photoluminescence (PL) spectra. Temperature measurement is achieved through an automated fit procedure based upon the independent boson (IB) model with additional Gaussian and Lorentzian broadening. We find there to be very good agreement between fit temperature and nominal (cryostat-measured) temperature. Further, the fit procedure enables extraction of other key parameters such as the material deformation potential and the QD confinement lengths. Also presented is a semi-analytical exact solution to the problem of phonon decoherence in a QD embedded in an optical microcavity. The approach is based on Trotter’s decomposition theorem and takes into account the effects of the exciton-cavity and exciton-phonon coupling on equal footing, thereby providing access to regimes of comparable polaron and polariton timescales. We show that the emission spectrum consists of two polariton lines, with optical decoherence determined by acoustic phonon-induced transitions between the polariton states. When viewed in the polariton frame, we find the dependence of the polariton line broadening on the exciton-cavity coupling strength to be well described by Fermi’s Golden Rule for real phonon-assisted transitions. For comparison, we additionally calculate the QD-microcavity absorption spectra according to well-known master equation approaches and examine the agreement between the differing methods. We show that there is good agreement between the approaches if the polariton dynamics are slow in comparison to the polaron timescale, but significant deviation at comparable polaron and polariton timescales. We attribute the observed discrepancies to a break-down in the master equation approach within the latter regime.

Medium echo wall mode microcavity sensor is mixed to surface plasmon daughter enhancement mode

Abstract: The utility model discloses a medium echo wall mode microcavity sensor is mixed to surface plasmon daughter enhancement mode, including tunable laser, polarization controller, tapered fiber, mixed medium microcavity, plasma nanoparticle, photoelectric detector, the laser of tunable laser output passes through the tapered fiber coupling and gets into mixed medium microcavity to form the resonance of echo wall mode in its inner total reflection, polarization controller is used for controlling the laser polarization state of enter cone shape optic fibre, photoelectric detector is used for recordand analysis by tapered fiber and the echo wall mode transmission spectrum that mixes the coupled system output that the medium microcavity constitutes, mix the medium microcavity and plate the high -refractive -index film layer by the optical microcavity surface and constitute, mix the medium microcavity on the surface with the plasma nanoparticle, mix the medium microcavity and arrange in in themiddle of the measurand. The utility model has the characteristics of compact structure, advantages such as sensitivity is high, response speed is fast have potential using value in biochemistry trace real -time detection field.

Theoretical Analysis and Simulation of A Novel Optical Microcavity

Abstract: We present a novel conical top-mirror micropillar resonator(CTMR) that can support smaller model volume and higher Q-factors than the same size micropillar because of the small base angles of conical mirror.

On the Position-Dependent Effective Mass in Bose Condensates of Photons and Polaritons in an Optical Microcavity Trap

Abstract: The effect of the particle position-dependent effective mass on the behavior of quasi-two-dimensional photon and exciton-polariton condensates in a parabolic trap in a semiconductor optical microcavity is investigated. It is demonstrated that the correct inclusion of the coordinate dependence of the effective mass in the kinetic-energy operator modifies the effective confining potential for the particles. Corrections to the energy and wavefunction of the photon Bose condensate are derived. For exciton-polaritons, it is shown that the choice of specific mirror geometry can lead to the change from repulsive to attractive particle–particle interaction.