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We demonstrate a novel comb tuning method for microresonator-based Kerr comb generators. Continuously tunable, low-noise, and coherent comb generation is achieved in a CMOS-compatible silicon nitride microring resonator.
Single-pulse (532 nm, 10 ns) micropatterning of silicon surfaces through a pinhole is demonstrated using scanning electron and atomic force microscopy. The results are compared to the Fresnel diffraction theory and physical mechanisms are discussed.
We report a terahertz waveguide fabricated from doped crystalline silicon. Anisotropic chemically etching is used to produce a periodic array of concave pyramidal troughs in the silicon that provide confinement in both transverse directions.
We investigated a disordered plasmonic nanolens using an extensive campaign of FDTD simulations. Our results show that surface roughness plays a crucial role in the enhancement of the electromagnetic energy with respect to regular structures.
We propose novel 1.55-µm capsule-shaped metallic-cavity lasers with curved facets to reduce plasmonic losses. Significant reduction of threshold current from 291 µA to 60 µA is demonstrated with effective modal volume of 0.45 µm3.
Surface plasmon vortices with arbitrary pattern are synthesized via geometrical designs. The resulting vortex intensity patterns are experimentally measured using a near-field scanning optical microscope and are in good agreements as compared to numerical results.
Using a near-field scanning optical microscope we investigate the optical response of a plasmonic metasurface consisting of a sub-wavelength periodic pattern in an ultrathin (10nm) silver film, which shows extraordinarily suppressed transmission in the visible.
We experimentally demonstrate an infrared refractive index sensor based on plasmonic perfect absorbers for glucose concentration sensing, with the figure of merit (FOM*) around 55 and a bulk wavelength sensitivity around 600nm/RIU.
We identify a hybrid plasmonic slot waveguide capable of millimetre range transport and deep subwavelength nanofocusing by varying slot width. Convenient integration with the SOI platform provides an important bridge between plasmonics and silicon photonics.
Two resonant bands in enhanced optical transmission were predicted in a star shape bull's eye plasmonic structure. Fundamental and its second harmonic resonance were analyzed parametrically to find optimal conditions for linear and nonlinear responses.
We experimentally demonstrate that a minute continuous-wave becalms Raman soliton and thus actively suppresses supercontinuum. The effects are characterized in detail by real-time spectrally-resolved statistical analysis enabled by optical time-stretch.
Erbium doped chalcogenide films were fabricated by cothermal evaporation and demonstrated propagation losses and lifetimes suitable for waveguide amplifiers. The 1490nm pumped Photoluminescence yield is up to ∼10x higher than the prior best film material, Er:TeO2.
A piezoelectric aluminum nitride film on oxidized silicon wafer is used to realize high frequency surface acoustic wave devices. Optical ring resonator is integrated with the surface acoustic wave device to demonstrate a high speed acousto-optic modulation.
Here we numerically investigate Brillouin scattering (BS) in a silicon slot waveguide. We show that BS is strongly influenced by the boundary effects, instead of the usual photo-elastic effect leading to the interaction with distinct mechanical modes.
Opto-mechanically controlled liquid crystalline elastomer (LCE) integrated tunable polymeric microgoblet lasers are fabricated on a silicon chip. Symmetrical deformation of uniaxially aligned LCE microcylinders enables expansion of the microgoblet resonators for tuning the lasing modes.
A novel athermal scheme based on resonance splitting of dual-ring structure is proposed and proved. An athermal resonator based on this scheme is demonstrated, achieving athermal transmission over a temperature range of at least 40K.
We present a polarization rotator and coupler that rotates the TE0 mode in a silicon waveguide and couples to the hybrid plasmonic (HP0) mode. Coupling factor of ∼ 60% and polarization conversion efficiency of ∼ 90% is achieved.
New results on integration of colloidal quantum dots (QDs) into SiN microstructures are reported, including QD positioning with nanometric accuracy and the efficient coupling of their emission to waveguides and cavities. The results are relevant to on-chip quantum optics and information processing.
We report an interferometer consisting of two spatially separated balanced Mach-Zehnder interferometers sharing a polarization entangled source. Nonlocal correlation statistics enable entanglement detection, Bell state identification, and fidelity bounding.
Near-infrared epsilon-near-zero metamaterial slabs based on Ag-Ge multilayers are experimentally demonstrated and numerically analyzed. A post-annealing process and multilayer grating structures are introduced to reduce the optical loss and also tune the epsilon-near-zero wavelength.
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