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Cellular contrast was demonstrated for the first time in lensfree on-chip holography by employing antibody-conjugated gold and silver nanoparticles (NPs) as contrast agents. Cytometric differentiation of CD4+ and CD8+ lymphocytes was achieved, after NP labeling, using machine learning algorithms.
A novel platform for decoupling the surface and bulk effects in plasmonic-based biosensors is proposed. Theoretical results show that the proposed platforms allows for three-mode spectroscopy rather than a single mode as in conventional plasmonic biosensors.
We demonstrate reflective color filters with high angular tolerance (± 65) in a metal-semiconductor-metal (MSM) resonator. The principle of operation and angular behavior of proposed filters are investigated and confirmed by numerical calculation and experiment.
The talk will focus on advances in high brightness single longitudinal/transverse mode master oscillator power amplifier (MOPA) QCls and MOPA QCL arrays capable of broadband tuning, as well as on low-divergence high brightness QCLs with plasmonic collimators. Specifically we will report on multi-wavelength arrays of master-oscillator power-amplifier quantum cascade lasers operating at wavelengths...
Excitons and plasmons in nanocrystals strongly interact via Coulomb and electromagnetic fields and this interaction leads to characteristic interference effects which can be observed in optical spectra [1–6]. An interaction between a discrete state of exciton and a continuum of plasmonic states gives rise to Fano-like asymmetric resonances and anti-resonances [2,4]. These interference effects can...
Semiconductor nanowires grown via the vapour-liquid-solid (VLS) mechanism are promising for miniaturisation of optoelectronic devices. Efficient optoelectronic devices require these nanowires to have high quantum efficiency. While optimizing the growth process to eliminate bulk defects and achieve perfect surface passivation is one approach to increase the quantum efficiency of nanowires1, coupling...
Conventional plasmonic structures provide field enhancement in the plane. The proposed nanoplasmonic three-dimensional surfaces, with unity coverage in the plan-view, enable surface-normal enhancement and achieve 7.2-fold stronger maximum field enhancement compared to the two-dimensional counterparts.
We propose a new type of CMOS-compatible polarization splitting antenna based on the dielectric-coated metal surfaces milled with a sub-wavelength aperture surrounded by asymmetric polarization-dependent indentations.
We have proposed and experimentally demonstrated a scheme for highly efficient excitation of surface plasmon using a structure consisting of an aperture in metal with a thin dielectric film at one side of the aperture.
We present a finite difference time domain (FDTD) study of gold nanofin structures to elucidate the effect of the structure parameters on their plasmonic properties. Fabrication techniques and measured results are also demonstrated.
Due to limitations in device speed and performance of silicon-based electronics, silicon optoelectronics has been extensively studied to achieve ultrafast optical-data processing. However, the biggest challenge has been to develop an efficient silicon-based light source since indirect band-gap of silicon gives rise to extremely low emission efficiency. Although light emission in quantum-confined silicon...
Detectors that take full advantage of the energy confinement offered by surface waves could have significant performance advantages in dark current and optical functionality. We use a subwavelength patterned metal nanoantenna structure to convert incoming plane waves to these surface waves.
We fabricated an ZnO based thin-film photo-transistor with electrically tunable photo-responsivity operating in the UV and visible spectra and designed plasmonic structures enhancing the device performance up to 6 folds below the band-gap of ZnO.
We describe a rigorous and physically transparent theory of enhancement of third order nonlinear optical processes achieved in plasmonic structures. The results show that while the effective nonlinear index can be enhanced by many orders of magnitude, due to high metal losses the most relevant figure of merit, the amount of phase shift per one absorption length remains very low.
Graphene interacts with light strongly in a broad wavelength range from sub-terahertz to ultraviolet. Moreover, such interaction can be adjusted by an electric field, making graphene suitable for a variety of tunable photonic applications. In this talk, I will first address the physics of light-graphene interaction within the single-electron framework in wafer-scale CVD graphene whose physical dimension...
A hybrid plasmonic waveguide consisting of a high-index dielectric ridge sandwiched between double graphene sheets is shown to support hybrid plasmonic modes at far-infrared regime with strong confinement and low damping rates.
Single-wall carbon nanotube deposition on gold-coated plasmonic optical fiber sensors has been proposed and demonstrated. The effects of carbon nanotubes on the polarization-dependent coupling of light from the fiber to the coating and on the resulting refractometric sensor properties are experimentally investigated.
We design a novel wedge hybrid terahertz (THz) plasmonic waveguide which features longer propagation length and deep-subwavelength mode confinement. It offers improved propagation length, normalized mode area and figure of merit 1.4, 13.5 and 5.3 times compared to the rectangular hybrid THz waveguide.
Engineered polaritonic metamaterials are shown to enhance nanoparticle optical trapping and sensing ability via cylindrical channel hybrid plasmon-polariton resonances. Geometric features supporting spatially and time-varying optical potentials that define polaritonic force landscapes are investigated.
We investigated surface plasmon resonance in super-period metal nano-gratings and demonstrated a surface plasmon resonance spectrometer sensor with a fabricated super-period metal nanoslit grating.
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