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Optically induced magnetization, whose relaxation time is of the order of a hundred picoseconds, and coherent oscillations of magnons in terahertz region were observed in an antiferromagnet NiO by polarization spectroscopy with the pump-probe technique.
This paper discusses the optical polarization anisotropic of a c-plane InGaN/AlInN quantum well under the tensile strain. The calculation results indicate that with particular In composition of AlInN alloy for the tensile strain, it is possible to reduce the quantum-confined Stark effect and make an out-planed polarized light source for edge emitting laser diodes or light emitting diodes.
Coherent G-mode phonon oscillations in few-layer graphene films were generated using ultrafast pump-probe spectroscopy. The frequency and the decay time were different depending on the thickness of the graphene layers.
Solar-cell efficiencies have exceeded 40% in recent years by use of multiple materials that span the solar spectrum, growth of these materials with near-perfect quality, and use of concentration. Growth of near-perfect semiconductor materials is possible when the lattice constants of the materials are matched or nearly matched to that of a single-crystal substrate.
Diagnosis of the on-target focal spot using the current OMEGA EP diagnostics is challenging due to differential piston uncertainty and calibration errors. Performance was improved by retrieving phase information from far-field images using numerical optimization.
We report here experimental demonstration of flexible solar cells based on crystalline semiconductor nanomembranes (NMs) transferred onto flexible PET (polyethylene terephthalate) substrates. For 1 micrometer thick p-i-n InP NMs, we obtained an open circuit voltage of 0.68 V and power efficiency of 1.5% from the photovoltaic solar cells. The results agree very well with the anticipated thin film InP...
For controlling non-resonant molecular fragmentation process, simultaneous effect of chirp and polarization of a femtosecond pulse is mutually independent. For multiphoton fluorescence microscopy and optical tweezers with high-repetition-rate lasers, inter-pulse separation and polarization is important.
We will present a futher understanding of the threshold transition in lasers operating at nanoscale, by measuring the threshold transition from a quantum, statistical and dynamical points of view at room temperature and telecommunication wavelengths.
Dielectric-loaded surface plasmon-polariton nanowaveguides on the gold film are fabricated by two-photon polymerization with femtosecond laser pulses. The leakage radiation microscopy shows that they are single-mode with strong mode confinement at 830 nm.
Through nonlinear scattering including stimulated Raman scattering and beam cleanup, a pulsed multimode pump beam is converted into a nearly diffraction-limited supercontinuum extending from 1 to 2 µm in a passive cladding-pumped nonlinear fiber converter.
We propose the use of titanium dioxide as cladding material to reduce the temperature sensitivity of silicon-based microresonators. The advantages of using titanium dioxide over the conventional alternatives are discussed, and experimental results are presented.
We demonstrate unconditional one-way quantum computation experiments using a linear cluster state of four entangled optical modes. Our results provide a first demonstration of the fundamental components for one-way quantum computation with continuous variables.
We demonstrate that cavities with Q∼107 can be designed in defect-free photonic crystals made of photosensitive material (chalcogenide). Since the high-Q mode can originate from an air-band, these cavities are ideal candidates for sensing applications.
Two coherent 1.5 μm frequency combs are transferred to 3.4 μm by difference-frequency generation with a 1064 nm cw laser. From a multi-heterodyne measurement, the residual linewidth between the comb teeth is resolution-limited at 200 mHz. Work of the U.S. government, not subject to copyright.
We reveal THz nonlinearity of liquid water using intense monocycle THz pulse. Single THz pulse response and THz pump-probe spectroscopy show the breaking and recovering of hydrogen bonding network in water molecules.
We propose and demonstrate a scheme that suppresses degradation induced by in-band crosstalk and amplified spontaneous emission (ASE) noise in differential phase shift keying signal, using feedforward control. Though in-band crosstalk in wavelength division multiplexing networks or ASE from optical amplifiers degrades system performance, we can suppress the degradation using the feedforward control.
Novel method for relative phase measurement between optical longitudinal modes has been proposed and named as “dual heterodyne mixing method”. It was applied for 12.5GBps BPSK signal sensing by 200MHz low-speed receiver.
Accessing the part of the spectrum where semiconductors behave like metals leads to extraordinary transmission in the UV regime and enhanced nonlinear plasmonic phenomena in the UV and soft X-ray wavelengths.
We report on our fiber-based mode-locked laser approach to the generation of ultra-low noise microwave signals, and its use for frequency metrology. We make use of two erbium fiber mode-locked lasers phase locked to a common ultra stable laser source to generate an 11.55 GHz signal with a relative phase noise of −111 dBc/Hz at 1 Hz from the carrier. The corresponding residual frequency instability...
The two principal effective dielectric constants of silver nanowire arrays are directly derived from the angular dependence of the Fabry-Perot peaks in transmission measurements. The hyperbolic wave vector surface is mapped from the experimental data.
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