Showing papers in "Journal of Modern Optics in 2019"
TL;DR: In this article, a plasmonic square ring resonator sensor design based on metal-insulator-metal waveguide was proposed, and the transmission spectra and electric field distribution of the resonator were simulated using t...
Abstract: A plasmonic square ring resonator sensor design based on metal–insulator-metal waveguide is proposed. The transmission spectra and electric field distribution of the resonator are simulated using t...
81 citations
TL;DR: The last decade has seen an intense renewed debate on tunnelling time, both from a theoretical and an experimental perspective as mentioned in this paper, and a review of recent developments and new insights in the field can be found in this paper.
Abstract: The last decade has seen an intense renewed debate on tunnelling time, both from a theoretical and an experimental perspective. Here, we review recent developments and new insights in the field of ...
68 citations
TL;DR: In this article, a surface plasmon resonance (SPR) sensor comprising a photonic crystal fiber (PCF) with an annular analyte channel outside the fiber is described and analyzed.
Abstract: A surface plasmon resonance (SPR) sensor comprising a photonic crystal fibre (PCF) with an annular analyte channel outside the fibre is described and analysed. The losses of the sensor are analysed...
68 citations
TL;DR: In this article, the geometric evolution of a linearly polarized light wave coupling into an optical fiber and the rotation of the polarization plane in the three dimensional semi-Riemannian manifold is discussed.
Abstract: We review the geometric evolution of a linearly polarized light wave coupling into an optical fiber and the rotation of the polarization plane in the three dimensional semi-Riemannian manif...
62 citations
TL;DR: In this paper, a two-dimensional photonic crystal based all-optical AND/OR logic gates are designed, simulated and optimized, based on a linear square lattice photoni...
Abstract: In this paper, a novel two-dimensional photonic crystal based all-optical AND/OR logic gates are designed, simulated and optimized. The structure is built on a linear square lattice photoni...
37 citations
TL;DR: In this article, the effect of two-photon absorption (TPA) on all-optical logic operation in quantum-dot semiconductor optical amplifier (QD-SOA) has been carried out.
Abstract: The effect of two-photon absorption (TPA) on all-optical logic operation in quantum-dot semiconductor optical amplifier (QD-SOA) has been carried out We model the rate equation with the TP
25 citations
TL;DR: In this article, the authors theoretically investigate the nonlinear effects in a hybrid quantum optomechanical system consisting of two optically coupled semiconductor microcavities containing a quantum dot and a Kerr nonlinear substrate.
Abstract: We theoretically investigate the nonlinear effects in a hybrid quantum optomechanical system consisting of two optically coupled semiconductor microcavities containing a quantum dot and a Kerr nonlinear substrate.The steady-state behaviour of the mean intracavity optical field demonstrates that the system can be used as an all optical switch. We further investigate the spectrum of small fluctuations in the mechanical displacement of the movable distributed Bragg reflectors and observe that normal mode splitting takes place for high Kerr nonlinearity and pump power. In addition, we have shown that steady state of the system exhibits two possible bipartite entanglements by proper tuning of the system parameters. The entanglement results suggest that the proposed system has the potential to be used in quantum communication platform. Our work demonstrates that the Kerr-nonlinearity can effectively control the optical properties of the hybrid system, which can be used to design efficient optical devices.
21 citations
TL;DR: A series of numerical simulation results are presented to validate the proposed colour image encryption method and check the robustness of the proposed method against various potential attacks.
Abstract: In this study, we propose a new optical colour image encryption technique using spiral phase transform and chaotic pixel scrambling. For encryption, three channels of the colour image i.e. red, gre...
20 citations
TL;DR: Deep learning models are developed for ultra-quick classifications of optical waveguide geometries into single- and multi-modal geometric regions, and it is illustrated how DL models can be developed with a minimal number of exact numerical simulations to Maxwell's equations.
Abstract: Single-mode operation is crucial in many on-chip integrated photonic devices, and thus the identification of single-mode geometries is an inevitable design requirement. In this article, we develop ...
19 citations
TL;DR: In this paper, a quantum orbit theory of high-order harmonic generation by bicircular laser field is presented, where the energy absorbed from the laser field was used to generate the harmonic signal.
Abstract: Quantum-orbit theory of high-order harmonic generation (HHG) by bicircular laser field is presented. HHG is a strong laser-field-induced process in which the energy absorbed from the laser ...
19 citations
TL;DR: In this paper, the (2 + 1)-dimensional nonlinear Schrodinger equation was studied in optical fiber and grey and black optical solitons of the model were reported using a suitable complex envelope.
Abstract: This work studies the (2 + 1)-dimensional nonlinear Schrodinger equation which arises in optical fibre. Grey and black optical solitons of the model are reported using a suitable complex envelope a...
TL;DR: In this article, a new configuration based on the combination of photonic crystal directional coupler and nonlinear electromagnetically induced transparency (EIT) phenomenon in solid-sta...
Abstract: In this paper, we introduce a new configuration based on the combination of photonic crystal directional coupler and nonlinear electromagnetically induced transparency (EIT) phenomenon in solid-sta...
TL;DR: A new scheme for encryption of single-channel colour images using amplitude- and phase-truncation approach to introduce non-linearity for enhanced security and it is shown that the proposed scheme resists the special attack.
Abstract: This paper presents a new scheme for encryption of single-channel colour images. The scheme uses amplitude- and phase-truncation approach to introduce non-linearity for enhanced security. Further, the colour image encryption is performed in the fractional Hartley domain, which is relatively less investigated. The encryption starts with an affine transform of each channel of the input colour image. Thereafter, one of the channels is considered as the input amplitude image while the other two are used as phase masks, one in the spatial and the other in the frequency domain. A detailed analysis of the scheme’s sensitivity to various encryption parameters has been carried out. In addition, security analysis of the scheme against attacks establishes the scheme’s robustness. The combined use of the affine transform and phase-truncation approach for colour image encryption in the fractional Hartley domain is attempted for the first time in this study. It is shown that the proposed scheme resists the spec...
TL;DR: In this paper, a miniaturized design of a Fabry-Perot resonator based on silicon strip and slot waveguide is presented, where corrugated Bragg gratings and a cavity are structured on both sides of a waveguide.
Abstract: A miniaturized design of a Fabry–Perot resonator based on silicon strip and slot waveguide is presented. The corrugated Bragg gratings and a cavity are structured on both sides of a waveguide. The spectral characteristics of both the resonator designs are studied. The variation of the medium refractive index is detected by monitoring the shift of the spectral maxima of the Fabry–Perot cavity. The transmission spectrum and electric field distribution of the sensor structures are simulated using finite-element method. The resonator based on slot-waveguide shows better sensitivity and figure of merits as compared to strip waveguide. Our proposed sensor design has the potential to find further applications in biomedical science and nano-photonic circuits.
TL;DR: In this article, Bragg gratings were incorporated in the standard ring resonator design in order to enhance the sensitivity of the refractive index sensor for enhancing the transmission spectrum and electric field.
Abstract: In this work, we incorporated Bragg gratings in the standard ring resonator design in order to enhance the sensitivity of the refractive index sensor. The transmission spectrum and electric field d...
TL;DR: Fresnel coefficients for electromagnetic propagation across an achiral/chiral boundary were examined in this article, and it was found that upon both transmission and reflection, the incident plane (specifica...
Abstract: Fresnel coefficients are examined for electromagnetic (EM) propagation across an achiral/chiral (ACC) boundary. It is found that upon both transmission and reflection, the incident plane (specifica...
TL;DR: In this paper, the authors investigated rigorously the behavior of light propagation in the closed contour of the linear Sagnac effect, assuming that the local light speed is c in a section of the contour.
Abstract: We investigate rigorously the behaviour of light propagation in the closed contour of the linear Sagnac effect. Assuming that the local light speed is c in a section of the contour, our approach ma...
TL;DR: In this paper, the minimal norm least squares solution for the reduced biquaternion (RB) matrix equation AX=B was derived by using the e1−e2 form of RB matrices, and the Moore-Penr...
Abstract: In this study, we derive the expressions of the minimal norm least-squares solution for the reduced biquaternion (RB) matrix equation AX=B by using the e1−e2 form of RB matrices, and the Moore–Penr...
TL;DR: In this article, a strong absorption is obtained by a graphene-metal nanostructure at near-infrared wavelengths, which consists of a single graphene layer on a metal film array with s...
Abstract: In this paper, a strong absorption is obtained by a graphene-metal nanostructure at near-infrared wavelengths. The proposed absorber consists of a single graphene layer on a metal film array with s...
TL;DR: In this paper, a two-dimensional multiplexing scheme with a ring radius and topological charge of perfect optical vortex (POV) beam is proposed, and on-off keying modulation is applied to demonstrate the bit error rate (BER) performance under atmospheric turbulence.
Abstract: Perfect optical vortex (POV) beam is a special kind of vortex beam, whose radius is independent of its topological charge. In this paper, we propose a two-dimensional multiplexing scheme with a ring radius and topological charge of POV beam. A communication system using the proposed multiplexing scheme with a two-step detection method is presented, and on–off keying modulation is applied to demonstrate the bit error rate (BER) performance under atmospheric turbulence. The numerical results show that the BER performance of the proposed scheme is better than that when only topological charge is multiplexed with the same conditions. The two-dimensional multiplexing scheme has an anti-interference capability since the ring radius is only concerned in magnitude. At the same time, the capacity and the spectral efficiency of the system are improved since both ring radial and topological charge of POV beam are used.
TL;DR: In this article, the bit error rate (BER) performance and outage probability of QAM/FSO communications with spatial diversity in turbulent environments were investigated, and the outage probability was analyzed.
Abstract: In this paper, the bit error rate (BER) performance and outage probability of quadrature amplitude modulation free space optical (QAM/FSO) communications with spatial diversity in turbulent environ...
Abstract: The propagation properties of a partially coherent Lorentz-Gauss vortex beam propagating in a uniaxial crystal orthogonal to the optical axis were studied. The analytical expressions of the partially coherent Lorentz-Gauss vortex beam propagating in a uniaxial crystal were derived. Based on the derived formulae, the average intensity properties and evolution properties of the coherent vortex of the partially coherent Lorentz-Gauss vortex beam propagating in a uniaxial crystal were illustrated using numerical examples. The influences of the uniaxial crystal and the parameters of the beam at the source plane of z = 0 on the average intensity and evolution properties of the coherent vortex for the partially coherent Lorentz-Gauss vortex beam are analyzed in detail.
TL;DR: In this article, a double imaging Mach-Zehnder Spatial Carrier Digital Shearography (DIM-SCDS) system is presented, which has two advantages over traditional SCDS.
Abstract: This paper presents a Double Imaging Mach–Zehnder Spatial Carrier Digital Shearography (DIM-SCDS) system. Compared to traditional Spatial Carrier Mach–Zehnder shearography, DIM-SCDS has two advanta...
TL;DR: In this paper, the authors demonstrate the generation of mode-locked Thulium-Doped Fibre Laser by employing a newly developed saturable absorber (SA) based on copper (Cu) thin film.
Abstract: We demonstrate the generation of mode-locked Thulium-Doped Fibre Laser by employing a newly developed saturable absorber (SA) based on copper (Cu) thin film. The SA was prepared by depositi...
TL;DR: A pixel-level image fusion method for merging two source images of the same scene using wavelet transform and gray-level features (GLF) is proposed, which indicates that the proposed method is more effective than relevant conventional methods.
Abstract: Image fusion makes the fused image more reliable and intelligible, and more suitable for human vision and computer detection, classification, recognition and understanding. This paper proposes a pi...
TL;DR: In this article, the propagation of ultrashort pulses in nonlinear MMs that is governed by a geostening effect was studied, where the self-steepening effect in a metamaterial can significantly change its behavior.
Abstract: Considering the self-steepening effect in a metamaterial (MM) can significantly change its behaviour. We study the propagation of ultrashort pulses in nonlinear MMs that is governed by a ge...
TL;DR: A novel mapping function is introduced to further improve the enhanced result of histogram equalization (HE) and get better performance on contrast enhancement and visual quality of the enhanced results.
Abstract: An adaptive contrast enhancement method is proposed in this paper. The proposed method is based on the contrast limited adaptive histogram equalization (CLAHE) and the histogram modificatio...
TL;DR: In this paper, the quadratic-cubic nonlinear Schrodinger equation was used as an approximate model for a relatively quasi-1D Bose-Einstein condensate coupled to a waveguide.
Abstract: We consider the quadratic-cubic nonlinear Schrodinger equation in the presence of external source, as an approximate model for a relatively quasi-1D Bose-Einstein condensate coupled to a waveguide....
TL;DR: In this paper, an all-optical device, which can perform XOR and XNOR functions in a single structure, was designed. And the proposed structure was realized by cascading two nonlinear resonant ri...
Abstract: In this paper, we aim to design an all-optical device, which can perform XOR and XNOR functions in a single structure. The proposed structure will be realized by cascading two nonlinear resonant ri...
TL;DR: The effect of quantum coherence involving macroscopic degree of freedom, and occurring in systems far larger than individual atoms are one of the topical fields in modern physics as mentioned in this paper, and it has been studied extensively in the literature.
Abstract: The effect of quantum coherence involving macroscopic degree of freedom, and occurring in systems far larger than individual atoms are one of the topical fields in modern physics. Because of materi...