Optical microcavity

About: Optical microcavity is a research topic. Over the lifetime, 2599 publications have been published within this topic receiving 72125 citations. The topic is also known as: optical microcavities.

Enhanced dipole-dipole interaction of CdSe∕CdS nanocrystal quantum dots inside a planar microcavity

Abstract: The energy transfer (ET) dynamics of closely packed CdSe∕CdS nanocrystal quantum dots (NQDs) embedded in a planar microcavity were studied by using time-resolved photoluminescence measurements. An increase of ∼20% was observed in the rates of ET from smaller to larger NQDs in the microcavity as compared with those measured in free space. This behavior was attributed to the enhanced dipole-dipole interactions between donor and acceptor NQDs at the spectral positions of the cavity modes.

Microcavity-enhanced surface-emitted second-harmonic generation for ultrafast all-optical signal processing

Abstract: By incorporating an integrated microcavity into an optical waveguide structure with vertical quasi-phase-matching, we have realized surface-emitted second-harmonic generation devices that significantly enhance the conversion efficiency for optical pulses in the picosecond and sub-picosecond regimes. We demonstrate both theoretically and experimentally that nonlinear interactions involving short optical pulses can be enhanced by a microcavity, even when the resonance width is substantially narrower than the spectral content of the pulse. The resulting enhancement enables practical signal processing functions such as ultrafast optical time-division demultiplexing at 1.55 /spl mu/m in multilayer AlGaAs structures.

Creating sharp asymmetric lineshapes in microcavity structures

Abstract: We disclose a new structure that allows the creation of sharp and asymmetric lineshapes in optical microcavity systems. In this structure, the response function can vary from 0% to 100% in a frequency range that is narrower than the full width of the resonance itself. Therefore, an optical switch, based upon this structure, may require far less frequency shift to operate, compared with conventional microcavity-based structures. This method may also be used to improve the sensitivity of optical sensors based upon microcavity structures.

Discrete-mode cancellation mechanism for high-Q integrated optical cavities with small modal volume

Abstract: A mechanism to reduce radiation loss from integrated optical cavities without a complete photonic bandgap is introduced and demonstrated. It is applicable to any device with a patterned substrate (including both low and high index-contrast systems), when it supports discrete guided or leaky modes through which power escaping the cavity can be channeled into radiation. One then achieves the associated increase in Q by designing the cavity such that the near-field pattern becomes orthogonal to these discrete modes, therefore canceling the coupling of power into them and thus reducing the total radiation loss. The method is independent of any delocalization mechanism and can be used to create high-Q cavities with small modal volume.

Optical information storing apparatus and method for production of optical deflector

Abstract: An optical waveguide is comprised of an optical substrate and an optical thin-film optical waveguide layer and formed such that ##EQU1## where θ is an output angle, n o1 is an ordinary refractive index of the optical substrate for an ordinary beam, n e1 is an extraordinary refractive index of the optical substrate for an extraordinary beam, n o2 is an ordinary refractive index of the optical thin-film optical waveguide layer for the ordinary beam and n e2 is an extraordinary refractive index of the optical thin-film optical waveguide layer for the extraordinary beam, and an electrode for generating a surface acoustic wave for diffracting light is formed on the optical waveguide to construct a collinear optical deflector. A method for production of the optical thin-film optical waveguide layer is exemplified wherein a target made of tantalic lilthium niobate or tantalic lithium niobate magnesium and an optical substrate made of lithium tantalate are prepared and an optical thin-film optical waveguide layer having a composition of tantalic lithium niobate or tantalic lithium niobate magnesium is formed on the optical substrate through an ion beam sputtering process into which oxygen can be introduced. Proton substitutes for part of an element constituting the optical thin-film optical waveguide layer.