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We report on ultrahigh sensitive broadband terahertz detection using asymmetric double-grating-gate high-electron-mobility transistors, demonstrating a record responsivity of 2.2 kV/W at 1 THz with a superior low noise equivalent power of 15 pW/√Hz.
Passive Q-Switching of Er-fiber-Er:YAG hybrid laser was realized by Cr:ZnSe saturable absorber. Single- and multi-modes regimes of operation were analyzed experimentally and theoretically. Preliminary theoretical prediction is in a satisfactory agreement with experimental data.
We demonstrate optical trapping and rotation of microparticles and bacteria with propelling beams. The rotation is achieved in a tweezers-like setting and fully controlled by SLM without the need of mechanical movement or phase-sensitive interference.
We propose and investigate partially-degenerate four-wave mixing as an efficient and ultrahigh-bandwidth method for improving the microwave gain of analog fiber optic links. A flat 9-dB gain is experimentally demonstrated over an ultra-wideband of 14GHz.
We present the first room-temperature photoluminescence from GaSb-based dilute-nitrides, enabled by minimizing the incorporation of non-radiative defects. This material system could provide a pathway for covering the 3–5 μm regime with diode lasers.
We demonstrate a microparticle splitter using a silicon nitride multimode-interference-based 1×2 power splitter. The 1μm-sized polystyrene particles are routed to the two output-ports with various branching ratios upon tuning the laser wavelength.
We report the first demonstration of single nanoparticle detection and size measurement in water using mode splitting in high-Q optical resonators. We achieved detecting and measuring polystyrene individual nanoparticles down to 75 nm in radius.
We report the first demonstration of compact, single mode, multi-direction lens-less edge-pumped all-ceramic Yb:YAG microchip laser. The preliminary result of 9-direction pump, single-mode, 33.7 W CW out power is successfully obtained.
It is shown from on-wafer measurement that a continuous wave output power of 0.35 mW at 305 GHz can be generated by photomixing in a metal-metal Fabry-Pérot GaAs photoconductor.
We present a large-scale label-free microarray with over one million plasmonic nanohole array sensors on a microscope slide. A dual-color filter imaging method is invented to dramatically increase the sensor performance in a highly-multiplexed manner.
A narrow linewidth THz source is reported. A beatnote provided by a dual-frequency laser is sent into a unitravelling carrier photodiode, and radiated by a transverse-electromagnetic-horn antenna. The emitted THz signal is detected by a subharmonic mixer coupled to an electrical spectrum analyzer. The measured linewidth is better than 30 kHz and tunable from DC to 770 GHz with a minimum 30 dB dynamic...
A Schottky-Barrier-Detector structure consisting of an array of metallic nanodisks embedded in Si-waveguide achieving ∼96% of total power absorption is proposed. This structure provides a step forward towards fully CMOS-compatible photonic-electronic integrated circuits.
We have developed injection-seeded terahertz-wave parametric generator pumped by a amplified microchip Nd:YAG laser. This generated high-peak-power, narrow-linewidth and tunable terahertz-wave with injection seeding by an amplified external cavity diode laser. We observed tunable terahertz-wave, peak power of more than 120 W and linewidth of less than 10 GHz by calibrated pyroelectric detector.
We demonstrate the generation of tunable, narrow-band, few-cycle and multi-cycle terahertz pulses from a temporally modulated relativistic electron beam through coherent transition radiation. OCIS codes: 320.0320
We demonstrated a high-power widely tunable terahertz-wave source by using a nonlinear organic crystal DAST pumped by a dual-wavelength optical parametric generator. High-power terahertz-wave in the range from 1.3 to 9 THz was obtained.
We demonstrate the existence of unidirectional optical Bloch oscillations in transversely magnetized, garnet/silicon-on-insulator waveguide arrays. This phenomenon enables the design and fabrication of multi-functional on-chip devices.
Threshold conditions of rolled-up microtube lasers have been theoretically studied. The study reveals that threshold is inversely proportional to the radius of the microtube and is verified experimentally.
Linewidth of buried heterostructure photonic crystal nanolaser are studied in terms of output power. We report a linewidth of 143.5 MHz and it is the narrowest linewidth ever reported for photonic crystal based lasers.
We obtained single-mode lasing in GaN nanowires by using a limited number of cavity modes and a narrow gain spectra. The fabrication was achieved by a top-down technique in high quality GaN films.
We demonstrate non-invasive, high-resolution, in vivo imaging of subcortical structures (the external capsule (EC) and hippocampus) within an intact mouse brain using three-photon fluorescence microscopy at the new spectral window of 1700 nm.
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