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We demonstrate a hybrid silicon micro-ring laser design with novel thermal shunts. With this technique the hybrid silicon ring lasers with a 50 μm diameter operate continuous wave up to 105 °C.
We demonstrate InAs/GaAs quantum dot lasers on silicon-on-insulator substrates by metal-stripe wafer bonding technology. Our III-V-on-Si bonded laser exhibits room-temperature lasing at 1.3 μm with current injection through the bonding metal stripe.
We predict quantum anomalous Hall phases in photonic crystals with large Chern numbers of 2, 3 and 4, and demonstrate their applications. Finally, we present experimental evidence for multimode unidirectional waveguides at microwave frequencies.
The formation mechanism of LIPSS has been investigated for titanium irradiated by double pulse. We found that variation of the surface plasma density characterized by first pulse led to a variation of the grating interspaces.
We study extraordinary optical transmission by placing a metal screen with a 1-D array of holes inside a parallel-plate waveguide at terahertz frequencies. We find excitation with TE1 or TEM mode strongly affects output transmission characteristics.
2.7-μm microjoule femtosecond pulses are generated in a metal coated hollow fiber thru four-wave-mixing parametric amplification. Numerical simulations predict generation of few-cycle optical pulses with the central wavelength extending beyond 10 μm.
The spin degree of freedom (DOF) of electrons was exploited for information processes such as magnetoresistive random-access memory and gave birth to the field of spintronics. Recently, the valley index, a new DOF, was discovered originated from an unbalanced carrier distribution in the momentum space in atomic membrane transition metal dichalcogenides (TMDCs), and optical valley excitation has been...
We present a reconfigurable transmission metasurface based on microfluidic system. As a proof of concept, the focal length of the metasurface is tuned from near-field region (1 λ) to far-field region (18 λ).
We investigate the optical characteristics of terahertz two-wire plasmonic waveguides, porous, and foam-based dielectric waveguides. Our group demonstrates a low-loss and low-dispersion hybrid metal wire-dielectric fiber resulting from fusion of the aforementioned types of waveguides.
The fabrication of complex metallic microstructures based on femtosecond laser micromachining and metal microsolidify process is demonstrated. This method is beneficial for building complex embedded 3D metal microstructures, electronic components, and hybrid electronic-microfluidic devices.
We study electric signals associated with surface plasmon propagation in rough and smooth silver films. The polarity of the signal can be controlled with light illumination and system geometry.
We realize an all-solid-state version of a macroscopic broadband omnidirectional invisibility cloak for diffuse visible light based on polydimethylsiloxane doped with titania nanoparticles. This cloak is portable, easy to handle, and suitable for school demonstrations.
Hyperbolic meta-materials based on ultrathin metal-dielectric multilayers have been studied by considering the nonlocal response of electrons in metal. We show that nonlocality will induce topological transitions of the iso-frequency surfaces and limit light-matter interactions.
We introduce general principles for maximally violating detailed balance in thermal radiation. We validate these principles by direct calculations, based on fluctuational electrodynamics, on thermal emitters constructed from magneto-optical photonic crystals.
We present atomically-thin photovoltaic solar cells based on van der Waals heterostructures of transition metal dichalcogenides and other two-dimensional semiconductors.
We present a widely tunable metasurface composed of microfluidic antennas with subwavelength thickness for dynamic beam steering. By controlling actively the length of supercell, the reflection can be tuned to arbitrary direction under normal illumination.
We propose a grating structure for the achievement of unidirectional coupling, which consists of two matched dielectric and metal long-period gratings. We verify our idea theoretically and experimentally with gratings formed along a polymer waveguide.
We present a method for direct calorimetric measurement of powder absorptivity using a thin laser illuminated disc. Powder porosity is measured independently and a scheme eliminating the effect of convective and radiative losses is implemented.
We developed a novel atomic layer lithography procedure to fabricate large area flat metallic surfaces with sub-10-nm features, which is particularly useful for fabrication of nanostructures with strongly localized field enhancement.
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