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We demonstrate an ultra-low-NA (∼0.038) Yb-doped step-index-fiber fabricated using conventional MCVD and solution-doping process. The fiber ensures ∼700μm2 Aeff for effective-single-mode operation and 81% laser efficiency with M2 ∼1.1 at a bend diameter of 32cm.
An LED chip with monolithically integrated, individually addressable multi-color pixels was demonstrated with a color tuning range from blue to green on a single epitaxial wafer.
We describe a modified local oxidation of silicon process as a platform for the fabrication of waveguides and ultra-high Quality factor (5.3·10) silicon resonators, with nearly fully planar interface for multilayer silicon integration.
Integrated microresonators based on SiN waveguides are an attractive platform for nonlinear optics. Here we present a new photonic Damascene fabrication process that solves common problems in SiN waveguide fabrication and demonstrate frequency comb formation.
Fluorescence is reported in waveguides fabricated via the ultrafast laser inscription technique in Erbium doped Gallium Lanthanum Sulphide (Er3+:GLS) for mid-infrared laser applications. The pump wavelength was 980nm leading to mid-infrared transition at 2.75 μm.
We report the development of nanodiamond-doped tellurite fibers with both preserved single photon emission properties of the nanodiamonds embedded in the glass and fiber loss reduced to levels suitable for practical applications.
The fabrication of complex metallic microstructures based on femtosecond laser micromachining and metal microsolidify process is demonstrated. This method is beneficial for building complex embedded 3D metal microstructures, electronic components, and hybrid electronic-microfluidic devices.
We demonstrate the performance and the reliable fabrication process of a 56 Gb/s wavelength-division multiplexing transmitter module with integrated feedback structures. The device is based on microring silicon depletion modulators, optimized for O-band comb-laser operation.
We report the study of InGaN/GaN multiple quantum wells (MQWs) grown on multi-facet microrods. The multi-facet MQWs have broad emission spectrum. Electrical injection was demonstrated with emission color ranged from red to blue.
We report on fabrication and characterization of 1D photonic crystal on a single erbium chloride silicate nanowire. Design and simulation show that a microcavity laser with Q-factor over 10000 is feasible from a single nanowire.
A suspended core fiber based on lead silicate glass has been fabricated to generate doughnut beams. Preliminary results demonstrated a potential to be a good candidate for fiber based cylindrical vector beams generation and propagation.
We demonstrated both theoretically and experimentally robust single-mode operation in all-solid photonic bandgap fibers with record effective mode areas of ∼2650μm2 by introducing multiple strongly coupled smaller cores in the cladding.
We report on the fabrication of polymeric whispering-gallery mode (WGM) lasers. Our approach enables high packing density by vertical stacking and multiplexed readout of resonators and lends itself to signal referencing or multi-target sensing.
Digital projection photochemical etching is a novel single-step process for fabricating customized gray-scale semiconductor structures. Several features including a variable height pyramid array are fabricated, demonstrating the resolution, range, accuracy, and dynamics of the technique.
Nanofabrication of metallic nanostructures/nanoparticles enables the detection of analyte molecules at ultra-low concentrations with the aid of plasmon induced hot-spots. The high fabrication cost and large fabrication time of nanostructures limit their usage in practical applications. Here we present a cost effective approach to recycle the SERS substrates.
We propose a new scheme, which is easy to implement and can be used to integrate low index nonlinear materials with silicon photonics to achieve high nonlinearly without suffering nonlinear losses.
We developed a novel atomic layer lithography procedure to fabricate large area flat metallic surfaces with sub-10-nm features, which is particularly useful for fabrication of nanostructures with strongly localized field enhancement.
We report on design and fabrication of a new hypocycloid core-contour Kagome HC-PCF based on a triangular-like shaped core exhibiting smaller effective area and comparable confinement loss than previous hypocycloid core-contour Kagome fibers.
Second harmonic 266nm generation was demonstrated by periodically-poled LaBGeO5 (PP-LBGO) with 2nd-order QPM structure. More than 15mW of 266nm was obtained from nanosecond-pulsed 532nm laser. Circular beam at 266nm without walk-off was obtained.
We fabricate 3D gratings and diffraction optics using direct laser writing. Diffraction patterns of gratings agree with Laue theory. We demonstrate zone plates for visible wavelengths. Direct laser writing is promising for integrated diffraction optics.
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