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Modern navigation systems integrate the global positioning system (GPS) with an inertial navigation system (INS), which complement each other for correct attitude and velocity determination. The core of the INS integrates accelerometers and gyroscopes used to measure forces and angular rate in the vehicular inertial reference frame. With the help of gyroscopes and by integrating the acceleration to...
We report on the development of a tunable microresonator-based sub-kHz extended cavity diode laser (ECDL) for frequency stabilization to an ultrastable high finesse super-cavity. The relative spectral linewidth after the stabilization is ∼ 1 Hz limited by the super-cavity.
We report time-dependent negative correlation between the beatnote of cross-polarization resonant modes and one of the polarization resonant modes, which could be utilized for improving the microcavity resonant frequency long-term stability.
We demonstrate a single-photon SWAP gate between polarization and spatial momentum on a SOI chip. 19.8% error ratio is obtained, and phase coherence of the SWAP operation is measured via single photon interference with up to 58.7% visibility.
We study experimentally and theoretically the use of photonic crystal nano-cavity to generate a broad range of waveforms, mediating by Drude electron-hole plasma in silicon, and coming from the dynamical states at varying operating conditions.
We report efficient on-chip Turing pattern formation, uniquely enabled by mode-hybridization induced phase matching. Destabilization of Turing pattern is circumvented, thereby achieving unprecedented pump depletion and record high external pump-to-comb conversion efficiency of 45%.
Cavity optomechanical sensors with high resolution can be affected by nonlinear optical spring effect. Theoretical analysis and experiment have been done to illustrate this effect and thermal Langevin force under nonlinearity has been studied.
We demonstrate the power dependence of high-Q OMOs, which permits pre-oscillation, oscillation, and chaos like performance. Power dependence on mechanical frequency is also modeled and simulations are compared to the measured data.
Synchronization between two very close mechanical modes in air-slot PhC optomechanical oscillators is observed with drive powers above threshold. Improvement in phase noise (−70 dBc/Hz at 10 kHz offset) for the synchronized OMO is reported.
We report an integrated silicon polarization rotator, with dual-level aligned fabrication. The rotator has record high 25-dB extinction, low 2-dB loss, with near-perfect rotation of 90.03±8.85 degrees across 100-nm wavelengths for chip-scale polarization diversity.
We report chip-scale Turing frequency comb with narrow linewidth of 9 kHz and long term stability of 160 kHz on THz carriers. The Turing comb is transferred onto a plasmonic photomixer, achieving 600 μW terahertz radiation with high 1.1% optical-to-terahertz power conversion at room temperature.
We demonstrate a new type of microresonator frequency comb where the momentum conservation law is fulfilled by azimuthal modulation of the waveguide dispersion, mathematically equivalent to the formation of Faraday instability. The concept expands the parametric range in which a microresonator frequency comb is obtained.
Single-shot real-time characterization of optical waveforms with sub-picosecond resolution is essential for investigating various ultrafast optical dynamics. However, the finite temporal record length of current techniques hinders comprehensive understanding of many intriguing ultrafast optical phenomena that evolve over a time scale much longer than their fine temporal details. Inspired by the space-time...
We study Kerr-comb stability with pump laser locked to ultrahigh-Q microresonator. Fractional instability of 1.26×10−10 is achieved, close to comb stability limit, 3.9×10−11 imposed by intensity noise of the optical pumping and environmental fluctuations.
We study the coherent comb formation by a bichromatic pump and detail noise state transitions by detuning the seeding. We also show comb spacing in a coherent state can be tuned by 40 MHz. The work paves a way towards coherently tunable comb oscillator for chip-scale RF-optical frequency division and clockworks.
Here we report a record solid-state optomechanical oscillator for acceleration detection down to the thermodynamical limit, at 730 ng/Hz1/2 resolution and 193 ng/Hz sensitivity, through optical pumping and RF readout of the radiation-pressure-driven backaction oscillation.
We demonstrate the controllable optomechanical coupling by changing the position of fiber anchored on device, and the intracavity locking between the OMO and self-pulsation showing 1/6 sub-harmonics in wide optical detunings in the optomechanical cavities.
We demonstrate a method to substantially increase the observation duty ratio in temporal-magnification system without sacrificing the temporal resolution. 30% or even 100% observation duty ratio can be achieved on a 10-ns or longer waveform.
We demonstrate a chip-scale optomechanical cavity operating around 77.7-kHz which exhibits 44+ GHz/nm optomechanical coupling. The 58-kHz force-induced RF dynamic range and 100+ order harmonics are obtained with frequency instability of ∼10−6 at 0.1 sec.
We report the results of systematic studies of plasmonic and photonic guided modes in large-area single-layer graphene integrated into a nanostructured silicon substrate. The interaction of light with graphene and substrate photonic crystals can be classified in distinct regimes of plasmonic and photonic modes.
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