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, a whispering gallery mode resonator is demonstrated in aqueous environment and the rate of change in splitting as particles enter the resonator mode volume strongly depends on the concentration of particle solution.
Abstract: Scatterer induced modal coupling and the consequent mode splitting in a whispering gallery mode resonator is demonstrated in aqueous environment. The rate of change in splitting as particles enter the resonator mode volume strongly depends on the concentration of particle solution: The higher is the concentration, the higher is the rate of change. Polystyrene nanoparticles of radius 50nm with concentration as low as 5x10^(-6)wt% have been detected using the mode splitting spectra. Observation of mode splitting in water paves the way for constructing advanced resonator based sensors for measuring nanoparticles and biomolecules in various environments.
57 citations
TL;DR: In this article, a nano-layer formation in situ on a silica microsphere in an aqueous environment by simultaneously following the shifts of whisperinggallery modes at two wavelengths was investigated.
Abstract: We optically characterize nanolayer (<150 nm) formation in situ on a silica microsphere in an aqueous environment by simultaneously following the shifts of whispering-gallery modes at two wavelengths. This approach was inspired by layer perturbation theory, which indicates that these two measurements can be used to determine independently both the thickness and the optical dielectric constant. The theory is verified for extreme cases and used to characterize a biophysically relevant hydrogel nanolayer with an extremely small excess refractive index of 0.0012.
57 citations
TL;DR: In this article, the optical modes of a photonic-crystal microcavity containing quantum wells were mapped and spectroscopy was performed using a near-field optical probe to reveal the imprint of the cavity mode structure on the quantum-well emission.
Abstract: We report the direct, room-temperature, near-field mapping and spectroscopy of the optical modes of a photonic-crystal microcavity containing quantum wells. We use a near-field optical probe to reveal the imprint of the cavity mode structure on the quantum-well emission. Furthermore, near-field spectroscopy allows us to demonstrate the strong spatial and spectral dependence of the coupling between the sources and the microcavity. This knowledge will be essential in devising future nanophotonic devices.
57 citations
TL;DR: A new microcavity design is proposed and structures are realized with a two-dimensional photonic-crystal slab that will permit the realistic realization of spontaneous-emission modification and on-off optical switches.
Abstract: A new microcavity design is proposed and structures are realized with a two-dimensional photonic-crystal slab. The cavity consists of seven defect holes that encompass a hexagon and is designed to reduce vertical light leakage. From a direct transmission measurement, a Q value of 816+/-30 is achieved at lambda =1.55 mum . This high- Q cavity will permit the realistic realization of spontaneous-emission modification and on-off optical switches.
57 citations
TL;DR: In this article, the spectral line shape and field distributions of single and interacting quantum dots were investigated for the collection and illumination mode of a scanning near-field optical microscope. But the results were limited to the case of quantum dots with large dipole moments.
Abstract: The near-field response of optically excited semiconductor quantum dots is theoretically investigated for the collection and illumination mode of a scanning near-field optical microscope. The study includes resolution, spectral line shape, and field distributions of single and interacting dots. It is shown that in contrast to near-field excitation of molecules with large dipole moments, the line shape and position of typical semiconductor quantum dots can be determined without a disturbance if realistic values for the intrinsic linewidth are assumed. The comparison of regular and irregular quantum-dot distributions yields characteristic signatures for disordered arrays, necessary to understand the optical response of realistic semiconductor quantum dot samples.
56 citations