The authors have demonstrated a surface plasmon device composed of resonant optical antenna integrated on the facet commercial diode laser, termed plasmonic laser antenna. This generates enhanced and spatially confined near fields. Spot sizes few tens nanometers been measured at wavelength ∼0.8μm. can be implemented in wide variety semiconductor lasers emitting spectral regions ranging from visible to far infrared, including quantum cascade lasers. It is potentially useful many applications...

We experimentally and theoretically demonstrate single-beam negative refraction superlensing in the valence band of a two-dimensional photonic crystal operating microwave regime. By measuring refracted electromagnetic waves from slab shaped crystal, we find refractive index $\ensuremath{-}1.94$ that is very close to theoretical value $\ensuremath{-}2.06$. A scanning transmission measurement technique used measure spatial power distribution focused radiate point source. The full width at half...

We report a surface enhanced molecular detection technique with zeptomole sensitivity that relies on resonant coupling of plasmonic modes split ring resonators and infrared vibrational self-assembled monolayer octadecanthiol molecules. Large near-field enhancements at the gap allow for this when absorption peaks overlap spectrally resonance. Electromagnetic simulations support experimental findings.

Silver is the ideal material for plasmonics because of its low loss at optical frequencies but often replaced by a more lossy metal, gold. This silver's tendency to tarnish and roughen, forming Ag(2)S on surface, dramatically diminishing properties rendering it unreliable applications. By passivating surface silver nanostructures with monolayer graphene, atmospheric sulfur containing compounds are unable penetrate graphene degrade silver. Preventing this sulfidation eliminates increased...

We report a bowtie plasmonic quantum cascade laser antenna that can confine coherent mid-infrared radiation well below the diffraction limit. The is fabricated on facet of and consists pair gold fan-like segments, whose narrow ends are separated by nanometric gap. Compared with nano-rod composed nano-rods, efficiently suppresses field enhancement at outer structure, making it more suitable for spatially-resolved high-resolution chemical biological imaging spectroscopy. near characterized an...

We experimentally demonstrate electrical tuning of plasmonic mid-infrared absorber resonances at 4 μm wavelength. The perfect infrared absorption is realized by an array gold nanostrip antennas separated from a back reflector thin dielectric layer. An indium tin oxide active layer strongly coupled to the optical near field allows for spectral tunability.

Emerging two-dimensional semiconductor materials possess a giant second order nonlinear response due to excitonic effects while the monolayer thickness of such active limits their use in practical devices. Here, we report 3300 times optomechanical enhancement harmonic generation from MoS2 doubly resonant on-chip optical cavity. We achieve this by engineering light-matter interaction microelectro-mechanical system enabled frequency doubling device based on an electrostatically tunable...

We present a systematic study of optical antenna arrays, in which the effects coupling between antennas, as well length, on reflection spectra are investigated and compared. Such arrays can be fabricated facet fiber, we propose photonic device, plasmonic fiber probe, that potentially used for in-situ chemical biological detection surface-enhanced Raman scattering.

This paper reviews recent work on device applications of optical antennas. Localized surface plasmon resonances gold nanorod antennas resting a silica glass substrate were modeled by finite difference time-domain simulations. A single length 150 or 550 nm resonantly generates enhanced near fields when illuminated with light 830 wavelength. pair these nanorods gives higher field enhancements due to capacitive coupling between them. Bowtie that consist triangular particles offer the best...

Resonant optical nanoantennas exhibit a different length scaling due to the surface plasmons compared their radio frequency counterparts. In this letter, we address difference by calculating wavelength-dependent effective mode index neff for cylindrical one-dimensional gold nanowire waveguide. Our results show that nanorod antennas act as dispersive and lossy Fabry–Pérot resonators plasmons.

We experimentally demonstrate dramatically enhanced light-matter interaction for molecules placed inside the nanometer scale gap of a plasmonic waveguide. observe spontaneous emission rate enhancements up to about 60 times due strong optical localization in two dimensions. This enhancement is nonresonant nature waveguide under study overcoming fundamental bandwidth limitation conventional devices. Moreover, we show that 85% molecular couples into highlighting dominance nanoscale mode...

Atomically thin transition metal dichalcogenides like MoS2 monolayers exhibit unique luminescent properties. However, weak quantum yield and low light absorption hinder their practical applications in two-dimensional emitting devices. Here, we report 1300 times enhancement photoluminescence emission from a monolayer via simultaneous Fano resonances dielectric photonic crystal. The spatially extended double resonance scheme allows resonant of both the emission. We also achieve unidirectional...

In this work, we report an integrated narrowband light source based on thin MoS2 emissive material coupled to the high quality factor whispering gallery modes of a microdisk cavity with spatial notch that enables easy out-coupling emission while it yields coherence and Gaussian intensity distribution. The active emitting consists chemically enhanced bilayer flakes atomic layer deposited SiO2 protective coating 20-times brighter photoluminescence compared as-exfoliated monolayers microdisk....

We report free space transmission and the first reflection measurements of a composite double negative (DNG) metamaterial, also known as left-handed material (LHM). The metamaterial composes split-ring-resonators discontinuous thin wires. Very high values are observed within frequency range for which both effective permeability permittivity expected to be negative.

A general, overarching theme in nanotechnology is the integration of multiple disparate fields to realize novel or expanded functionalities. Here, we present a graphene enabled, integrated optoelectromechanical device and demonstrate its utility for biomolecular sensing. We experimentally achieve an ultrawide linear dynamic sensing range 5 orders magnitude protein concentration, improvement over state-of-the-art single mode nanosensors by approximately 2–3 magnitude, while retaining...

Nanoplasmonics has been an attractive area of research due to its ability localize and manipulate freely propagating radiation on the nanometer scale for strong light-matter interactions. Meanwhile, nanomechanics set records in sensing mass, force, displacement. In this work, we report efficient coupling between infrared nanomechanical resonators through nanoantenna enhanced thermoplasmonic effects. Using conversion electromagnetic energy mechanical plasmo-thermomechanical platform with a...

In this theoretical work, we report on voltage-controllable hybridization of electromagnetic modes arising from strong interaction between graphene surface plasmons and molecular vibrations. The strength depends strongly the volume density dipoles, relaxation time, layer thickness. Graphene offers much tighter plasmonic field confinement longer carrier time compared to noble metals, leading Rabi splitting hybridized polaritonic at three-orders-of-magnitude lower densities. Electrostatically...

Filament-free bulk resistive-switching random access memory (RRAM) devices have been proposed to offer multilevel conductance states with less variations and noise forming-free operation for neuromorphic computing applications. Understanding conduction mechanism switching dynamics of filament-free RRAM is crucial optimize device characteristics build large-scale arrays compute in Here, we first analyze by temperature-dependent <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...

With Moore’s law nearing its end due to the physical scaling limitations of CMOS technology, alternative computing approaches have gained considerable attention as ways improve performance. Here, we evaluate performance prospects a new approach based on disordered superconducting loops with Josephson-junctions for energy efficient neuromorphic computing. Synaptic weights can be stored internal trapped fluxon states three connected multiple (JJ) and modulated by input signals applied in form...