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We demonstrated antenna-assisted mid-infrared graphene detectors at room temperature with more than 200 times enhancement of responsivity (0.4 V/W at λ0=4.45 µm) compared to devices without antennas (<2 mV/W).
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.
A simple and robust technique to extract the complex optical conductivity of truly two-dimensional materials is developed. Applying the method to chemical-vapor-deposited graphene, we extract the complex conductivity, including Fermi level and scattering time.
A drastic Q factor variation from 7900 to 1200 is observed in a silicon ring resonator loaded by micrometer-scale graphene with various lengths. The significant decay of the Q factor agrees with a numerical analysis.
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 demonstrate an all fiberized, passively mode-locked thulium holmium co-doped fiber laser operating at a wavelength of ∼1.95 µm using the graphene-oxide evanescent field interaction. A temporal pulse width of ∼590 fs is experimentally obtained at 33.25 MHz.
Giant gain enhancement effect of surface plasmon polaritons (SPPs) on terahertz (THz) stimulated emission in optically pumped monolayer graphene has been experimentally studied. We observed the spatial distribution of the THz probe pulse intensities under linear polarization of optical pump and THz probe pulses. It was clearly observed that an intense THz probe pulse was detected only at the area...
Using a tape-assist-transfer method and micromanipulation, we have fabricated graphene coated ZnO nanowire (GZN) optical waveguides. The GZNs exhibit significant saturable absorption (differential transmission of 15% at 1064nm), which can be employed for optical modulation.
We demonstrate THz-induced transparency in two types of single-layer CVD graphene samples utilizing high-field THz pulses. The nonlinear THz transmission depends on the local conductivity of the samples and dynamically varies in the time domain.
Electrons in graphene are described by massless Dirac Fermions with unusual electrical and optical properties. The Moire superlattice in graphene/boron nitride heterostructure strongly modifies the electronic structure, and leads to unusual changes in infrared absorption.
We demonstrate a nanotube mode-locked fiber laser with low repetition rate (244 kHz), enabling supercontinuum generation in photonic crystal fiber spanning 600 to 2000 nm, at a low average pump power of 87 mW.
We proposed a novel meta-structure of gold/graphene trimers and realized ultrasfast and ultra-low power all-optical tunable plasmon-induced transparency around 1150 nm. The nonlinear susceptibility of graphene/ITO film was up to 2.90×10−5 esu.
We report a high-power graphene mode-locked ceramic Cr:ZnS-laser, producing 3.9 nJ, 140 fs pulses with 45 nm spectral bandwidth at 270 MHz repetition rate, at output power for the first time exceeding 1 W level.
We present graphene-based optical modulators integrated with Si3N4 waveguides which provide broadband flat absorption from visible to infrared wavelengths. Tunable attenuation of 0.067 dB/µm is measured in Mach-Zehnder interferometers and microring resonators.
We report electrically driven light emission from a two-dimensional monolayer tungsten diselenide (WSe2). Our device is operated as a lateral p-n junction diode, formed by electrostatic doping.
Using a realistic quantum master equation we show that the Mollow triplet of a quantum dot can be tuned by adjusting its local density of states via biasing of a graphene monolayer.
We investigate the carrier relaxation dynamics in graphene oxide (GO) using ultrafast optical-pump terahertz-probe spectroscopy. Unlike graphene, we observe the dynamics of GO show rapid percolation behaviors related to the multi-particle Auger scattering.
Using ultrafast optical-pump terahertz-probe spectroscopy, we study the THz dynamics and electronic cooling in few-layer epitaxial and CVD graphene; a microscopic theory of carrier-carrier and carrier-phonon interactions accounts quantitatively for the observed dynamics.
Photoexcited charge carriers in 2D graphene and in 1D graphene nanostructures were studied with optical pump-THz probe spectroscopy. We find efficient hot-carrier multiplication in 2D graphene, and predominantly free carrier early-time response in 1D nanostructures.
Carrier dynamics in a single-layered graphene has been studied by ultrabroadband terahertz time domain ellipsometric spectroscopy and time resolved optical pump THz probe technique. We successfully observed the frequency-dependent sheet conductivity of the optically-pumped graphene with and without the photo excitation. Above the optical fluence of 200 µJ/cm2, the negative conductivity indicating...
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