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We demonstrate stimulated polariton emission at room temperature in a dielectric microcavity embedded with ZnO nanoparticles. The polariton lifetime is also shown to decrease drastically above the stimulated emission threshold.
We have created microcavity polaritons with a lifetime of about 200 ps, which allows them to condense in the ground state of a ring trap. Optical measurements show they have quantized vorticity.
We report on the large Kerr induced wavelength shift observed in our hydrogenated amorphous silicon microresonators and demonstrate their use for all-optical modulation and switching on picosecond time scales with only subpicojoule pulse energies.
We demonstrate a broadband Kerr frequency comb and mode-locking in a globally-normal-dispersion microresonator. A record short on-chip pulse of 74-fs is directly measured. Supported by analytical theory and numerical modeling, we describe the mode-locking mechanism.
We propose a novel and ultrasensitive scheme of rotation sensing by measuring farfield intensity from an asymmetric microcavity laser. We optimize the cavity shape and show the farfield sensitivity is enhanced by introducing structural chirality.
Spectral cleaning in bottle microresonators is presented by inscribing periodic surface microgrooves. Cleaning down to single strong WGM family is demonstrated, with Qs > 105 (similar to original microresonator).
Temporal dissipative solitons in microresonators constitute a novel class of ultra-short optical pulse generators. Here we study the influence of resonator mode-structure, particularly avoided mode crossings, on soliton formation and derive resonator design criteria.
We propose a novel scheme for a single-shot, fast (10s of nanoseconds), high fidelity (99.95%) quantum non-demolition (QND) readout of quantum dot (QD) electron spins based on their spin-dependent Coulomb exchange interaction with optically-excited quantum well (QW) microcavity exciton-polaritons.
A photonic crystal (PC) waveguide based optical filter that enables dense integration of high sensitivity L55 PC microcavities for biosensor microarrays is demonstrated.
We demonstrate an organic polariton condensate that exhibits nonlinear interactions at room-temperature. Upon reaching threshold, we observe a superlinear power dependence, a power-dependent blueshift and the emergence of long-range spatial coherence resulting from polariton interactions.
The coherence properties of a frequency comb generated by a SiN microring resonator is shown to be changed by the feedback through a self tracking, narrowband single longitudinal mode filter in an active fiber loop.
We investigated harmonic mode locking in a microcavity with split-step Fourier method and demonstrated it experimentally. Harmonic mode locking in an ultra-small cavity allows us to obtain ultra-high repetition rate pulse trains.
We provide a quantitative analysis of the coherence in microresonator frequency combs. We show how to achieve coherent transform-limited pulses on-chip without actively manipulating the pump setting conditions in the course of comb formation.
Site-controlled single Ge quantum dot was grown on patterned silicon-on-insulator substrate. The single dot was then precisely embedded into a photonic crystal microcavity. Resonant photoluminescence was observed from the single Ge dot in the cavity.
Typical L-type photonic crystal (PC) microcavities have a dynamic range of approximately 3–4 orders of magnitude in biosensing. We experimentally demonstrated that multiplexing of PC sensors with different geometry can achieve a wide dynamic range covering 6 orders of magnitude with potential for 8 or more orders with suitable optimization.
We investigate experimentally and theoretically the role of higher-order-dispersion on the bandwidth of microresonator-based parametric frequency combs. Our results demonstrate that fourth-order dispersion plays a critical role in determining the spectral bandwidth.
We present a novel scheme for precise phase measurements of individual modes in microresonator-based optical frequency combs. We find microcomb states with characteristic phase-steps of multiples of π and π/2 in the comb spectrum.
We report an experimental study of transient optomechanically induced transparency (OMIT) using a silica microresonator. The transient OMIT behaviors are observed in good agreement with theoretical calculations based on the coupled-oscillator model.
By placing a J-aggregated organic semiconductor dye in a microcavity, strong-coupling can be evidenced at room temperature, making such systems ideal for exploration of polariton physics. Using CW photoluminescence (PL) spectroscopy, the different mechanisms by which excitons are able to populate polariton states along the upper and lower polariton branches are revealed. Such strong-coupled microcavities...
We demonstrate strong coupling and a coherent polariton laser in a microcavity consisting of a sub-wavelength grating in the top mirror. The designable grating mirror allows 3D confinement, polarization selectivity, and dispersion engineering by design.
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