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By carefully designing diagonal transitions in the active region, we present a broadband mid-infrared quantum cascade detector with photocurrent ranging from 3.9 to 9.6 μm, more than 2 times broader than stacked designs.
A hybrid silicon ring laser in which the counter-clockwise circulating power is coupled into the clockwise mode is demonstrated. Unidirectional clockwise laser output is achieved with a suppression ratio of 19 dB over the counter-clockwise mode.
We theoretically investigate the role of point reflector's reflectivity in the performance of forward-pumped high power random fiber lasing, and demonstrate that the maximum 1st-oder random lasing output power can even increase when the reflectivity decreases from 0.9 to 0.01.
A design rule to obtain broadband high reflection and transmission in 2D high contrast gratings is proposed. Our design method is convenient for engineering the orbital angular momentum of light using 2D grating array.
We present an external-cavity-diode-laser for quantum sensor applications based on distributed feedback diode laser with resonant feedback from an external cavity. The intrinsic linewidth is 31 Hz. Design, micro-integration concept and experimental results are shown.
Continuous and incoherent laser range finder is presented, based on repeating transmission of Legendre amplitude codes and post detection compression. The cyclic correlation sidelobes of the sequences are identically zero. The concept is demonstrated experimentally.
Dynamic tunability of the plasmonic resonance in graphene nanoribbons is desirable in the near-infrared. We demonstrated a constant blue shift of plasmonic resonances in double-layer graphene nanoribbons with respect to single-layer graphene nanoribbons.
We investigate the plasmonic nanodipole antenna with sub-microscopic nanogap. Relevant quantum conductivities, including both linear and nonlinear components, are observed due to the photon-assisted quantum tunneling, realizing optical nano-radiators with enhanced amplitude and frequency modulations.
Ultra-compact wavelength tunable laser diode with wide tunability was successfully developed with combining quantum dot optical amplifier and silicon micro-ring filters. The single mode laser oscillation was demonstrated with 25 nm wavelength tuning range.
The adaptive sampling clock was extracted by dual THz-comb-referenced spectrum analyzers and used for THz dual comb spectroscopy (THz-DCS) with unstabilized dual lasers. The demonstrated results implied better spectroscopic performance than THz-DCS with stabilized lasers.
Three-fold enhancement of fluorescent light collection in low numerical aperture optical systems is demonstrated using self-assembled micro-reflectors around individual micro-particles.
Numerical and experimental results demonstrate a stochastic sensing technique based on enhancing intensity fluctuations. Statistical moments of reflectivity can be recovered, which characterize scattering from static and dynamic targets placed in random environments.
Glass solar reflectors, similar to those widely used to concentrate sunlight in solar thermal plants, form the basis for REhnu's HCPV generators. Multijunction cells are housed in small, upgradeable units at each mirror focus.
Diode-pumped 1.9-μm Tm:KYW microchip laser with 1.6 W TEM00 cw output power operates with 72% slope efficiency relative to the absorbed pump power. Output power of 2.5 W is achieved with generation of a doughnut transverse mode. Q-switched laser operation with pulse duration of 2.2 ns at 1.5 MHz repetition rate is demonstrated.
We present a novel solar concentrator architecture in which integrated microscale liquid optics provide passive solar tracking, eliminating the need for high-precision mechanical tracking. Optical efficiency as high as 72% and effective acceptance angle of 50° are demonstrated. The design can reduce the cost of concentrator photovoltaics and broaden its applicability.
Hexagonal LuFeO3 is a multiferroic showing ferroelectricity and antiferromagnetism at room temperature. Below TR=130 K, it becomes ferrimagnetic. Ultrafast optical pump-probe measurements reveal that the dynamics are correlated with the structural changes responsible for ferrimagnetism.
A combination of experimental techniques is used to demonstrate that optical field concentration and Ohmic losses in planar chiral plasmonic metasurfaces depends on the handedness of circularly polarized light. Chiral dischroism in transmission is demonstrated.
We demonstrate novel high contrast metastructures with nearly all optical power concentrated in the −1st order diffraction and, when embedded in a flexible substrate, color change is achieved simultaneously in a multiple-color pattern by design.
We numerically design and study graphene metasurface to modulate the phase of reflective light. Results show that the phase of the reflection can range almost from -π to π just by changing the width of the graphene ribbons, while the amplitude of the reflection can keep in a small variation. By using graphene metasurface, we realize negative reflection and nano focusing.
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