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 article, the authors studied nonradiative energy transfer between semiconductor nanocrystals (NCs) placed in a Fabry-Perot microcavity and found that the spectrally integrated fluorescence from a monolayer of single sized NCs in the cavity is enhanced by a factor of 4.8 compared to free space.
Abstract: The authors have studied nonradiative energy transfer between semiconductor nanocrystals (NCs) placed in a Fabry-Perot microcavity. The spectrally integrated fluorescence from a monolayer of single sized NCs in the cavity is enhanced by a factor of 4.8 compared to free space. For a monolayer of mixed sized NCs, the acceptor NC fluorescence intensity is enhanced by an additional factor of 2.7 due to energy transfer processes. When the cavity mode is resonant with the acceptor NC fluorescence emission maximum, donor NC emission is completely suppressed, providing a narrow spectral output.
22 citations
TL;DR: The cavity-induced Raman efficiency modifications are tested by folded-acoustic- and optical-phonon scattering experiments, finding quantitative accord with theory.
Abstract: We present a model for Raman efficiency in a planar microcavity. We calculate the modifications of excitation and emission induced by optical confinement in a $\frac{3\ensuremath{\lambda}}{2}$-thick GaAs/AlAs multiple quantum well grown on a semiconductor-distributed Bragg reflector. Such a structure constitutes a low-finesse asymmetric microcavity. Both excitation and emission are shown to depend strongly on photon frequency, leading to enhancements of up to a factor of 50 for a double resonance process. The cavity-induced Raman efficiency modifications are tested by folded-acoustic- and optical-phonon scattering experiments, finding quantitative accord with theory.
22 citations
TL;DR: In this article, the authors show that strong light-matter coupling can be used to overcome a long-standing problem that has prevented efficient optical emission from carbon nanotubes, which is due to the fast nonradiative scattering to the dark exciton state having a lower energy.
Abstract: We show that strong light–matter coupling can be used to overcome a long-standing problem that has prevented efficient optical emission from carbon nanotubes. The luminescence from the nominally bright exciton state of carbon nanotubes is quenched due to the fast nonradiative scattering to the dark exciton state having a lower energy. We present a theoretical analysis to show that by placing carbon nanotubes in an optical microcavity the bright excitonic state may be split into two hybrid exciton–polariton states, while the dark state remains unaltered. For sufficiently strong coupling between the bright exciton and the cavity, we show that the energy of the lower polariton may be pushed below that of the dark exciton. This overturning of the relative energies of the bright and dark excitons prevents the dark exciton from quenching the emission. Our results pave the way for a new approach to band-engineering the properties of nanoscale optoelectronic devices.
22 citations
TL;DR: In this paper, the authors demonstrate evanescently coupled bilayer microcavities with Q-factors exceeding 250 fabricated by a simple spin-coating process, where the cavity architecture consists of a slab waveguide lying upon a low refractive index spacer layer supported by a glass substrate.
Abstract: We demonstrate evanescently coupled bilayer microcavities with Q-factors exceeding 250 fabricated by a simple spin-coating process. The cavity architecture consists of a slab waveguide lying upon a low refractive index spacer layer supported by a glass substrate. For a lossless guide layer, the cavity Q depends only on the thickness of the low index spacer and in principle can reach arbitrarily high values. We demonstrate the versatility of this approach by constructing cavities with a guide layer incorporating CdSe/ZnS core/shell quantum dots, where we observe strong coupling and hybridization between the 1S(e)-1S3/2(h) and 1S(e)-2S3/2(h) exciton states mediated by the cavity photon. This technique greatly simplifies the fabrication of high-Q planar microcavities for organic and inorganic quantum dot thin films and opens up new opportunities for the study of nonlinear optical phenomena in these materials.
22 citations
01 May 2003
TL;DR: An organic light emitting diode with a microcavity structure has been fabricated in this article, where the intensity enhancement at the resonance wavelength is 2.3 compared to a non-Cavity device.
Abstract: An organic light emitting diode with a microcavity structure has been fabricated. The intensity enhancement at the resonance wavelength is 2.3 compared to a non-cavity device. The emission color is also modified from a yellow-green of non-cavity device to a primary green for the microcavity device. The experimental results compared well to theoretically calculations.
22 citations