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We developed an adhesive bonding process to integrate silicon nanomembranes onto silicon chips. A grating-coupled 1-to-32 H-tree optical distribution is experimentally demonstrated with an excess loss of 2.2 dB and a uniformity of 0.72 dB.
The optical low-coherence interferometry built with an optical ruler was proposed to demonstrate silicon-wire transverse-magnetic polarized indices of refraction and birefringence as 2.02 and 0.64, respectively, from the microring resonator effective length using various interferograms.
We demonstrate a 2D grating emitter that emits circularly polarized light beam synthesized from a waveguide mode. A micro-heater is integrated to control handedness of the circularly polarized light. The device shows emission efficiency of about 8%, while simulations predict much higher efficiency of 72% with ideal conditions. Such a device could serve as an interface between silicon photonic waveguides...
We demonstrate a chip-scale slot-type photonic crystal optomechanical oscillator fully integrated with an on-chip waveguide Ge photoreceiver, which exhibits high-harmonic tunable RF oscillations and high-quality optical resonances with controlled detuned continuous-wave laser drive.
Interference, one of the major physical phenomena, relies on coherent superposition of waves, undertaking different phase lag. Considering vectorial near-fields structure, the fundamental concept was reconsidered, reformulated, and demonstrated at optical and radio frequencies.
We demonstrated using full-wave simulations that phased array antennas patterned on optical waveguides can strongly affect mode coupling and propagation in the waveguides. We designed broadband small-footprint integrated photonic devices based on the concept.
Photon echo measurements were conducted on the 3H4 → 7D2 transition of Pr3+, on a slab waveguide of TeO2 deposited on a substrate of 0.005%Pr3+ : Y2SiO5. Optical coherence times of 62µs were observed, which is consistent with the bulk sample value of 111µs, given the level of instantaneous spectral diffusion. The results indicate that planar waveguide technology could be utilized for quantum communication...
We verified interferometrically generation of spatially pure photon pairs via spontaneous parametric down-conversion in a multimode nonlinear waveguide in the 800 nm spectral region, obtaining two-photon interference visibility robustly exceeding 90% without any spatial filtering.
We present arbitrary wave plate operations on-chip based on the reorientation of the waveguide's optical axis caused by additional stress fields. A successful implementation of Hadamard and Pauli-X gates for quantum light is shown.
In 2013, Tornado Spectral Systems introduced OCTANE-860, the first chip-based nanophotonic spectrometer for spectral-domain OCT. Technology advantages and challenges have been identified during development and a new strategy for optimizing performance will be discussed.
We fabricated a VCSEL incorporating a polarization-independent HCG mirror on SOI for a novel polarization-bistable functional device. The VCSEL oscillated under an optical short pulse excitation at 300 K.
A novel polarization converter and filter based on silicon multimode interference couplers (MMI) has been demonstrated. The measured transmission spectra of the proposed device for the light with arbitrary polarization exhibit a good performance.
A novel polarization and dichroic dual-functional splitter is proposed, with ultra-high polarization splitting ratios >33dB and >36dB for TE- and TM-polarized modes, respectively; and with high wavelength splitting ratios >26dB and >33dB for 650nm and 850nm, respectively.
Second harmonic generation from GaP nanopillars with optimized mode field overlap is analyzed and experimentally demonstrated. We present dispersion engineering in arrays of nanopillars to satisfy modal phase matching.
We theoretically investigate non-reciprocal mode-conversion arising from Stimulated Brillouin Scattering (SBS) in sub-micron nanophotonic waveguides. We find that hybrid acoustic modes can be efficiently generated via radiation pressure, leading to enhancement of SBS-based mode conversion.
1.5µm degenerate-frequency photon pairs are generated in a silicon micro-ring cavity by reverse degenerate spontaneous four wave mixing. Their quantum interferences in Mach-Zehnder interferometers are demonstrated, showing their potential in quantum metrology and quantum information.
We experimentally observe in situ the resonance due to an integrated resonant cavity inside a parallel-plate waveguide excited by the TE1 mode. We also observe a field enhancement associated with this narrowband resonance.
Nonreciprocal polarisation mode conversion is demonstrated in semiconductor waveguides with an alternating periodic upper cladding incorporating a segmented magneto-optic iron garnet fabricated with a novel lift-off process and crystallised by rapid thermal annealing.
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