Topic
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.
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TL;DR: In this paper, a novel microcavity design that allows the control in wavelength of the resonant modes of a microcave operating in the visible spectrum has been proposed, which is able to shift the modes by up to 56 nm.
Abstract: We report a novel microcavity design that allows the control in wavelength of the resonant modes of a microcavity operating in the visible spectrum. We have been able to shift the modes by up to 56 nm. The device is comprised of a thin film of a fluorescent semiconducting polymer combined with an electrically switchable liquid crystal layer, which are sandwiched between the two cavity mirrors. This structure serves as a tool for further experimental studies of the properties of microcavities and also has considerable technological potential, providing, for example, an efficient wavelength converter or tunable light source.
33 citations
TL;DR: In this paper, a rolled-up thin-walled oxide tubular microcavity delivers a new optical component for light coupling and may imply interesting applications in the interaction between light and matter.
Abstract: Nanomembrane self-rolling offers the manufacture flexibility of 3D architectures for various applications in photonics, robotics, electronics, etc. Rolled-up oxide microtubes fabricated by both wet chemical etching and dry-releasing methods enable a broad range tuning of diameters (from 1 to 15 μm) and therefore same to their optical whispering gallery modes (WGMs). Their thin walls (several tens of nanometers) of such tubular optical microcavities provide strongly on-resonance coupling of attached dye emitters to optical modes, which leads to a cavity enhancement for Raman scattering without importing noble metal. Rolled-up thin-walled oxide tubular microcavity delivers a new optical component for light coupling and may imply interesting applications in the interaction between light and matter.
33 citations
TL;DR: In this paper, the authors consider Bose-Einstein condensation of photons in an optical cavity filled with dye molecules that are excited by laser light and derive a Langevin field equation that describes the dynamics of the photon gas and its equilibrium properties and relaxation towards equilibrium.
Abstract: We consider Bose-Einstein condensation of photons in an optical cavity filled with dye molecules that are excited by laser light. By using the Schwinger-Keldysh formalism we derive a Langevin field equation that describes the dynamics of the photon gas and, in particular, its equilibrium properties and relaxation towards equilibrium. Furthermore we show that the finite lifetime effects of the photons are captured in a single dimensionless damping parameter that depends on the power of the external laser pumping the dye. Finally, as applications of our theory we determine spectral functions and collective modes of the photon gas in both the normal and the Bose-Einstein condensed phases.
33 citations
TL;DR: In this article, a single terrylene molecule embedded in a cholesteric-liquid-crystal host is used to demonstrate operation of a room-temperature single-photon source.
Abstract: Fluorescence antibunching from single terrylene molecules embedded in a cholesteric-liquid-crystal host is used to demonstrate operation of a room-temperature single-photon source. One-dimensional (1-D) photonic-band-gap microcavities in planar-aligned cholesteric liquid crystals with band gaps from visible to near-infrared spectral regions are fabricated. Liquid-crystal hosts (including liquid crystal oligomers and polymers) increase the source efficiency, firstly, by aligning the dye molecules along the direction preferable for maximum excitation efficiency (deterministic molecular alignment provides deterministically polarized output photons), secondly, by tuning the 1-D photonic-band-gap microcavity to the dye fluorescence band and thirdly, by protecting the dye molecules from quenchers, such as oxygen. In our present experiments, using oxygen-depleted liquid-crystal hosts, dye bleaching is avoided for periods exceeding one hour of continuous 532 nm excitation.
33 citations
TL;DR: In this article, the authors present a platform for testing the device performance of a cavity-emitter system, using an ensemble of emitters and a tapered optical fiber, and show that the fiber-coupled average Purcell factor is 2-3 times greater than that of free-space collection, although due to ensemble averaging it is still a factor of 3 less than the Purcell Factor of a single, ideally placed center.
Abstract: In this work, we present a platform for testing the device performance of a cavity–emitter system, using an ensemble of emitters and a tapered optical fiber. This method provides high-contrast spectra of the cavity modes, selective detection of emitters coupled to the cavity and an estimate of the device performance in the single-emitter case. Using nitrogen-vacancy (NV) centers in diamond and a GaP optical microcavity, we are able to tune the cavity onto the NV resonance at 10 K, couple the cavity-coupled emission to a tapered fiber and measure the fiber-coupled NV spontaneous emission decay. Theoretically, we show that the fiber-coupled average Purcell factor is 2–3 times greater than that of free-space collection, although due to ensemble averaging it is still a factor of 3 less than the Purcell factor of a single, ideally placed center.
33 citations