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We study the time- and spectrally-resolved exciton dynamics of a few-layer molybdenum disulfide using ultrafast optical pump-probe spectroscopy. We find that the carrier induced broadening significantly influence on the band-edge transmission spectra even with small carrier densities.
We report the experimental implementation of a bulk metamaterial with an all-angle left-handed response in the ultraviolet. Using this metamaterial, we fabricate an optically switchable Veselago flat lens capable of imaging arbitrary two-dimensional objects beyond the near field.
We demonstrate a selective ammonia sensor based on a silicon photonic microring resonator functionalized with nanoporous silicate films. The potential of this sensor as a low cost, portable and real-time medical breath monitoring device is discussed.
Transparent conductive oxides (TCOs) as substitutes to metals could offer many advantages for low-loss plasmonic and metamaterial (MM) applications in the near infrared (NIR) regime. By employing a lift-off process, we fabricated 2D-periodic arrays of TCO nanodisks and characterized the material's plasmonic properties to evaluate the performance of TCOs as metal substitutes.
We investigate the complex conductivity of silver nanowire thin films using terahertz time-domain spectroscopy. The measured conductivity shows a characteristic non-Drude response unlike bulk metals. The interesting behavior is explained by the Gans approximation and the Drude-Smith model.
We demonstrate substrate-transferred crystalline coatings, based on epitaxial Bragg mirrors directly-bonded to fused silica, exhibiting an unprecedented tenfold reduction in Brownian noise. These mirrors promise a significant advancement in the performance of precision optical interferometers.
We present theoretical design and experimental demonstration of surface-normal modulation on a gold metallic photonic crystal slab. It requires a moderate index modulation of 0.0043 that is induced by thermal-optical effects of the glass substrate.
We present the design and demonstration of ultra-thin plasmonic color filters, providing a powerful approach for subtractive color filtering with high spatial resolution and ultra-compact architectures on sub-micrometer scales.
The wavelengths and amplitudes of narrowband polarized cladding mode resonances in tilted fiber Bragg gratings provide high-Q probes of the anisotropic optical properties of various metal and semiconducting nanoparticle coatings and of their surroundings.
We will report a new self-assembly method to produce an plasmonic optofluidic network. Various topology structural networks are obtained in the process to mimic biological liquid channel systems.
Nanostructured polymer surfaces with optical functionality are fabricated by up-scalable methods, nanoimprinting and injection moulding. The fabrication and performance of nanostructured polymer surfaces with anti-reflective functionality are discussed.
A method for measuring optical thickness changes in a thin film using a single laser beam is proposed and demonstrated. Theory suggests that when a half plane phase shift is applied to a Gaussian laser beam, interference fringes appear in the far field which position varies with the amount of phase shift. By measuring fringe pattern displacements, we demonstrate detection of optical changes in microns-thick...
The optical absorption @1064 nm in Ta2O5 and SiO2 thin films is affected with simultaneous illumination ranging from 266 to 780 nm. The effect is attributed to filling of trap states in the forbidden gap.
Vanadium dioxide (VO2) films have optical properties that are strongly temperature dependent. Optical switching of VO2 thin films with co-planar surface electrodes is demonstrated and characterized for possible spatial light modulating applications in the mid-infrared. Switch time, amplitude, voltage, and recovery are reported for electrode gap sizes from 200 to 800 microns.
We show enhancement in optical nonlinear absorption by engineering the coupling between excitons of 3,4,7,8-naphthalenetetracarboxylic dianhydride (NTCDA) and ZnO nanowires. Energy transfer between the excitonic systems and exciton scattering are found to be competing processes.
Thin-film coating of LiNbO3 crystals with chromium was found to greatly enhance the usefulness of UV direct-written domains: the surface damage is strongly reduced thus improving the quality of the, moreover deeper and wider domains.
We demonstrated thermal nanoimprint fabrication of low loss waveguides and microring resonators in thermally evaporated and solution processed chalcogenide glass films. A high micro-ring quality factor of 75,000 is achieved at 1550 nm wavelength.
Ultra-violet pulsed laser irradiation coupled into a metal nanowire network through plasmonic absorption leads to localized welding of junction points. This approach enables direct integration of transparent metal films with organic photovoltaic and light emitting devices.
A new direction in femtosecond laser nano-structuring of transparent dielectric films is presented towards ejecting thin layers and forming internal nano-voids that open new directions in film coloring, flexible surface structuring and 3D microfluidics.
Because of the ability to concentrate light into subwavelength dimensions, plasmonic nanostructures have become a new frontier of nano-photonics, with promising applications for energy transport and conversion. In this work, we experimentally measure the near field intensity distribution of light squeezed through a subwavelength plasmonic hole in a thin metal film. Both transmission coefficient and...
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