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Self-assembly approaches to construct plasmonic materials often result in high-symmetry structures within a thermodynamic limit. Here we demonstrate a novel selective self-assembly route for synthesis of a new class of nanoplasmonic structures with symmetry-breaking.
We demonstrate that trapping of femtosecond laser pulses of relativistic intensity deep within nanowire arrays volumetrically heats matter into a new ultra-hot plasma regime with electron densities nearly 100 times critical and multi-keV temperatures.
We introduce a helix-based metamaterial, a circular polarization converter, composed of pairs of oppositely-handed helices on a square array. We compare our theoretical findings to measurements on samples made by laser lithography and electroplating.
A monolayer of MGITC molecules in a gold nanosphere-plane junction is excited by focusing a radially polarized laser beam. A record electromagnetic enhancement factor of 1010 for deterministic SERS experiments has been obtained.
We fabricate, experimentally characterize and numerically validate the origin of modes on periodically spaced T-shaped structure for Terahertz input. Effect of parameters such as height, periodicity, asymmetry and symmetry of ‘T’ structure is explained.
Optically pumped gold nanowire, 330 nm in diameter imbedded into silicate optical fiber produces broadband, highly collimated radiation (in the range 470–900 nm) with divergence of less than 4 mrad.
We demonstrate for the first time the assembly of an array of gold particles using a guided-resonance mode of a photonic-crystal slab. The 200nm diameter particles form a triangular lattice with spacing of 1140 nm and exhibit high stability.
By engineering parallelogram antenna on ZnSe substrate, we can control the wavefront of laser beam and design a flat lens at 10µm. The fabricated flat lens has demonstrated focusing effect matching well with simulation.
We design and fabricate a vertical hybrid SPP waveguide. The suitability of ultrahigh-bandwidth data transmission through the proposed waveguide by transmitting 1.8-Tbit/s (161 wavelength 11.2-Gbit/s) WDM OFDM 16-QAM is studied. The BERs of all 161 channels are less than 1e−3.
We proposed a novel meta-structure of gold/graphene trimers and realized ultrasfast and ultra-low power all-optical tunable plasmon-induced transparency around 1150 nm. The nonlinear susceptibility of graphene/ITO film was up to 2.90×10−5 esu.
The fluorescence is experimentally controled with bandgap engineering of structured metal surface. Grating duty ratio is optimized as 3/4 and narrow emission spectra are obtained by coupling between Fabry-Pérot cavity and surface plasmon polariton modes.
High-throughput detection of a large-area chip-based gold nanoslit biosensing array was detected using an imaging system based on white light Fourier transform spectrometry, with the detection sensitivity 0.02 in index change and 60nM of anti-BSA.
Ultrafast thermalization of electrons in metal nanostructures is studied by means of pump-probe spectroscopy. We track in real-time the plasmon resonsance evolution, providing a tool for understanding and controlling gold nanoantennas non-linear optical response.
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.
Progress in the excitation of ‘dark-modes’ in plasmonic structures is reported. The interaction of vector beams possessing a spatially inhomogeneous polarization profile with plasmonic nanostructures provides an avenue to probe these resonances.
An intricate relationship between the intensity of surface-enhanced Raman scattering (SERS) and the optical extinction are revealed. The observed unusual trend of SERS intensity decrease with the increase of extinction is explained analytically and numerically.
Reduced cross section and strong plasmon confinement allows ITO antennas to be integrated at extremely high densities with no loss in performance due to long-range transverse interactions and to hold promise for extremely sub-wavelength SEIRS.
We report on experimental and theoretical results on EELS from 12nm single-crystal gold films. Our results show that momentum resolution of the electrons gives insight into signatures of non-locality and quantum nature of the excitations.
We present structural and molecular-contrast imaging of mouse brain tumors using photo-thermal optical coherence tomography (PT-OCT) in vivo. Based on strong PT response of gold nanostars, we demonstrate clear visualization of brain cancer margins.
We use thermophoresis to accumulate and quantify biomolecules under a laser-induced temperature gradient. As biomolecules accumulate at the heated region, the concentration of the molecules can be determined based on the level of accumulation.
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