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Open-access microcavities are an original approach for lab-on-a-chip optofluidic sensing since they offer a direct access to the confined electromagnetic field. This work describes their basic characteristics for refractive index and nanoparticle sensing.
We experimentally demonstrate avalanche sub bandgap detection of light at 1550 nm wavelength via surface states using the configuration of interleaved PN junctions along a silicon waveguide. The device operates in a fully depleted mode.
Using an optofluidic chip with an integrated nanopore, a mixture of nanobeads and influenza viruses were opto-electrically detected. Different types of nanoparticles can be distinguished by different fluorescence wavelengths and fluorescence correlation functions.
Low-loss nonlinear AlGaAs waveguides are fabricated using plasma-assisted photoresist reflow. A 6.8-dB continuous-wave four-wave mixing conversion efficiency in a 1.35-µm-wide waveguide, and a 44-nm half-width 3-dB bandwidth in a 0.65-µm-wide waveguide are demonstrated.
Monolayer graphene sheet has been integrated on top of small disk optical resonator in SOI platform. Electro-optic interaction between graphene and whispering gallery mode of the cavity has been demonstrated and studied for modulation application.
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.
We present the fabrication and characterization of a graphene stack that can function as the darkest material and serve as the basis for a new class of sensitive, high-speed photodetectors.
We present a 20 Gb/s monolithically integrated transmitter with stacked CMOS driver and periodic-loaded PN-junction Mach-Zehnder modulator fabricated in IBM's sub-100nm technology node. Transmitter extinction ratios of 10 dB at 20 Gb/s are demonstrated.
A new type of “black silicon” materials with high optical absorptance and annealing-insensitivity is designed and fabricated by femtosecond laser pulses. These results have important implications for the fabrication of highly efficient optoelectronic devices.
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 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.
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.
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.
Recent advances in quantum dot based quantum technology are presented: scalable fabrication of bright sources of single photons or entangled photon pairs, optical non-linearities at the few photon scales and first implementations of quantum gates.
We designed and fabricated silicon nitride micordisk-waveguide vertical coupling devices processed at a low temperature of 270°. We experimentally demonstrate an intrinsic quality factor of 7.2×104 in the disk with only 15µm radius operating near 1310nm.
We observe experimentally a transition of quality factor scaling from third power to fifth power of the number of periods in periodic silicon optical waveguides designed to exhibit a degenerate band edge.
We experimentally demonstrate an order of magnitude higher radiated power from a 1550 nm photomixer with plasmonic contact electrodes in comparison with an analogous photomixer without plasmonic contact electrodes in the 0.25–2.5 THz frequency range.
Experimental evidence of enhanced spontaneous emission from InP coupled to an optical antenna is presented. Photoluminescence measurements show a 120x increase in light emission from antenna-coupled devices over bare InP emitters.
We demonstrate an on-chip optical phased array fabricated in a CMOS compatible process with continuous, fast (100 kHz), wide-angle (51o) beam-steering that is suitable for applications such as low-cost lidar systems.
A Huygens' surface that efficiently refracts normally incident light to an angle φr = 35° at telecommunication wavelengths is reported. This represents the first experimental demonstration of an isotropic metasurface that provides wavefront control for arbitrarily polarized light.
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