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Traditional low-refraction-index devices are usually supported by a pedestals, introducing an extra air layer compared with real on-chip devices, which cannot meet the demand of optical interconnection. In this work, we proposed and experimentally demonstrated silica microtoroids bonded on high-refractive-index silicon substrate realizing good light confinement [1]. With proper microtoroid minor diameter,...
We experimentally realized on-chip deformed microcavities supporting both highly unidirectional emission and ultrahigh Q factors exceeding 108. This type of microcavity holds potential in ultralow-threshold laser and sensitive nanoparticle detection.
We experimentally realized on-chip deformed microcavities supporting both highly unidirectional emission and ultrahigh Q factors exceeding 108. This type of microcavity holds potential in ultralow-threshold laser and sensitive nanoparticle detection.
In the strong coupled cavity optomechanics, we find the island structure in the temporal evolution map of mean phonon number. Analytical results are provided to obtain the optimal cooling limits with the frequency matching condition.
We demonstrate strong anharmonicity of the polariton dressed states in a highly dissipative cavity quantum electrodynamics system via dark state resonances. Vacuum Rabi oscillation and photon blockade occur even for decay-to-interaction rate ratio exceeding 100.
We theoretically study hybrid photonic-plasmonic modes in a composite structure in which a silicon microdisk is vertically coupled to a metal microdisk. Benefitting from the low-loss property of whispering gallery modes and the strong field localization of plasmonic modes, the hybrid modes hold potential advantages over conventional photonic or plasmonic devices, in particular toward optical force...
We report experimentally the chaos-assisted excitation of high-Q whispering-gallery modes in a deformed microcavity by a sub-wavelength fiber taper. This chaos-mediated coupling combines the advantages of fiber taper and free-space coupling.
We propose uniquely dynamically-modulated dissipative cooling scheme in strong optomechanical coupling, which significantly enhances the cooling process. This overcomes quantum backaction and instantaneous phonon occupations below the steady-state cooling limit can be achieved.
We describe coupled-cavity scheme to achieve ground-state cooling of mechanical motion in highly-unresolved sideband regimes. Through EIT lineshapes, both quantum Langevin and master equations confirm the quantum noise characteristics and achieve κ/ωm greater than 104.
We propose a composite cavity quantum electrodynamics system in which the resonant structure consists of a metal nanoparticle and a whispering-gallery microcavity. The system enables more than 100-fold enhancement of the cooperativity parameter.
We observe Fano resonance in a single microresonator, in which two modes are excited simultaneously through a fiber taper. Our analysis reveals that the Fano resonance originates from an indirect-coupling of two originally orthogonal modes.
We propose a new kind of plasmonic whispering gallery modes that can be highly localized in the exterior of a metal-coated microresonator, and possesses high quality factors at room temperature.
A new method based on the well-studied boundary element method (BEM) is introduced to calculate ultra-high quality factors (Q) of whispering-gallery modes (WGMs) by studying the Poyting vector. In traditional numerical method, Q can be obtained through the formula Q = -Re(k)/2Im(k) by solving the wavenumber (k) of resonances, such that the precision of Q is determined by the wavenumber k. On the other...
We study the coupling between a fiber-taper and two whispering-gallery modes simultaneously excited in a single PDMS-coated silica microtoroid theoretically and experimentally. The transmission spectrum of the fiber coupled two-mode resonator shows a sharp electromagnetically-induced-transparency-like window.
With the coupled-mode theory, we analyzed the energy transmission between the microsphere cavity and waveguide system, and revealed the mode coupling strength in a bare microsphere coupled with a fiber taper theoretically and experimentally. In a practical taper-microsphere coupling system, the traveling wave clockwise (CW) and counterclockwise (CCW) whispering gallery modes (WGMs) should existed...
<para> We theoretically describe and study coupling between two whispering-gallery-mode microcavities through a side coupled fiber taper. The two microcavities can couple to each other bidirectionally with only one fiber taper waveguide due to the modal coupling between a pair of whispering-gallery modes traveling in opposite directions. By choosing appropriate physical parameters, some interesting...
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