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Transmission and reflection properties, anisotropy, chirality, optical nonlinearity and luminescent of metamaterials can be controlled at will using dynamic nanostructures reconfigurable with electromagnetic forces or by exploiting structured illumination with coherent light.
Using an optofluidic chip with an integrated nanopore, a mixture of nanobeads and influenza viruses were opto-electrically detected. Different types of nanoparticles can be distinguished by different fluorescence wavelengths and fluorescence correlation functions.
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.
We demonstrate coherent control of the generalized Snell's law in ultrathin gradient metasurfaces constructed by an array of V-shaped slot nanoantennas.
A hand-held probe combining high-resolution reflectance confocal microscopy (RCM) and optical coherence tomography (OCT) within the same optical path was developed and preliminarily tested for assessing skin burns. The preliminary results show that these two optical technologies have complementary capabilities that can help the clinician to more rapidly identify the dermal-epidermal junction, determine...
We demonstrate high-density, multi-level crystallization of a Ge2Sb2Te5 thin film using tightly focused femtosecond laser pulses. The optical reflectivity in each distinct phase states level is characterized for applications in ultra-fast cognitive parallel data processing.
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...
A Huygens' surface that efficiently refracts normally incident light to an angle φr = 35° at telecommunication wavelengths is reported. This represents the first experimental demonstration of an isotropic metasurface that provides wavefront control for arbitrarily polarized light.
We experimentally demonstrate deterministic optical writing of a quantum dot-confined dark exciton, in a pure quantum state using one optical pulse. We then control the spin state of this long-lived exciton using picosecond optical pulses.
We report on linear and nonlinear infrared and plasmonic properties of chalcogenide crystal of the Bi-Sb-Te-Se family that was recently identified as a prospective platform for switchable broadband plasmonic devices.
We propose a planar retroreflector composed of two cascaded high contrast periodic structures with slowly varying features. One of the high contrast structures focuses the light while the other reflects it as a concave mirror.
More than 2 Watts of continuous-wave external power at 3400 nm was obtained by difference frequency mixing of 1064.6 nm and 1549.8 nm fiber lasers in a periodically poled lithium niobate crystal at 50 °C.
We demonstrate a chip-scale slot-type photonic crystal optomechanical oscillator fully integrated with an on-chip waveguide Ge photoreceiver, which exhibits high-harmonic tunable RF oscillations and high-quality optical resonances with controlled detuned continuous-wave laser drive.
V-shaped air slits inscribed in a metallic thin film is used to achieve cross-polarized anomalous refraction with high efficiency. The experimental refraction angles are in excellent agreements with theoretical values.
We demonstrate a simple and effective solar tracking system for collection of sunlight in an optical fiber. The system incorporates a mirror whose axes were controlled based on the known equation of solar motion.
We use intense broadband THz pulses to excite underdoped YBCO exhibiting competing superconducting and charge density wave ground states. We observe pronounced coherent oscillations at 1.85 and 2.65THz, attributed to renormalized low-energy phonon modes.
Excitons are studied experimentally and theoretically in atomically thin WS2 layers. We find a binding energy of 0.32eV as well as non-hydrogenic behavior of the exciton states due to the non-uniformity of the dielectric environment.
The optical nonlocalities in metal-dielectric multilayer metamaterials are characterized as functions of incident angles for different polarizations. The measured epsilon-near-zero frequency shifts due to nonlocal effects agree with the theoretical analysis developed from transfer-matrix method.
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...
In this work we experimentally demonstrate suspended gold-air-gold (MIM) plasmonic waveguides operating at the NIR wavelengths. The waveguide interfaces with the far field using optical nano-antennas with main beams normal to the structure.
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