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Nanoshells are one of versatile plasmonic nanostructures in biomedical applications due to highly tunable optical properties and near-field enhancement. By exciting the nanoshell-plane junction with a radially polarized (RP) focused excitation, we have obtained further near-field boosting and consequent highly sensitive surface enhanced Raman scattering (SERS) of a monolayer of malachite green isothiocyanate...
Optical nano-antennas have been used for many applications in many contexts [1]. The possibilities to control both field enhancement and spatial distribution, to tune the resonant wavelength, and to design the local phase constitute unique assets that explain the popularity of plasmonic nano-antenna. In this work, we propose to use plasmonic nano-antennas integrated in a silicon photonic integrated...
When a metal nanostructure is locally photoexcited at a resonant wavelength, a plasmonic wave packet is generated and propagates on the surface of the nanostructure. The wave packet dynamics is closely related to plasmon mode characteristics of the material, and is regarded as one of major origins of the unique optical characteristics of metal nanostructured materials. Spatial scales of plasmon resonances...
Plasmonic metamaterials, composed by arti?cial micro or nanostructures, exhibit extraordinary optical properties such as negative refraction, which cannot be observed in nature. The focused ion beam (FIB) and electron beam lithography (EBL) technique are frequently adopted to fabricate multilayer and three-dimensional plasmonic structures, but the alignment error, high cost and time consuming cannot...
Large enhancements of the magneto-optical (MO) activity by the localized surface plasmon resonance (LSPR) have been reported in structures like nanodisks, core-shell nanoparticles, dimers, etc.. In this contribution, we extend this application to the magnetoplasmonic split ring-ring structure. With the hole-mask colloidal lithography method (Fig. 1(a)), a split Au ring is generated on the bottom Au...
Optical tweezers have become an efficient tool to trap microscopic and nanoscopic objects and manipulate their mechanical motion via optical forces and torques [1–3]. In this talk we discuss our recent experimental and theoretical works on trapping and manipulation of micrometer-size Janus particle with half surface of polystyrene particle coated with nanometer-thick gold thin film in various optical...
Graphene, with its unique electrical, optical, mechanical, and chemical properties, attracts enormous research interests from various fields since it was first exfoliated from bulk graphite in 2004. It is believed that the potential of graphene in photonic and optoelectronics is significant, as it exhibits both extraordinary electronic and optical properties. Especially, graphene is considered as...
This paper clarifies the conditions for multipoint identification of Au mirror sensors in the Optical Sensory Nerve Network (OSN). Since the Au mirror sensor is a type of hetero-core optical fiber sensor, it conducts detection by measuring the attenuation amount of light from the sensor. Because the trap message of Simple Network Management Protocol (SNMP), which contains a different identification...
Passive THz s-SNOM (scattering-type scanning near-field optical microscope) is a powerful tool, which can reveal the weak spontaneous radiation on a sample surface (e.g., Au, GaAs, or SiC) without external light source [1, 2]. In our passive s-SNOM, an extremely sensitive CSIP (charge-sensitive infrared phototransistor [3]) detector is necessary to be operated at low temperature less than 10 K. To...
We study the exciton emission from ensembles of uncoated and plasmonic gold/aluminum quinoline (Alq3) coated GaAs-AlGaAs-GaAs core-shell nanowires (NWs) and GaN nanorods using time-integrated (TI) as well as time resolved (TR) photoluminescence (PL). The ∼ 150nm diameter zincblende NWs were grown on GaAs substrate using the Au catalyzed vapor-liquid-solid method. The wurtzite GaN nanorods of ∼ 250nm...
Terahertz (THz) spectroscopy is a promising way to measure the spectrum of low-frequency modes of molecules or ensembles, such as crystals and polymers, including proteins. However, the main drawback of THz spectroscopy is its extremely low sensitivity. In the present study, we report on signal enhancement in THz spectroscopy achieved by depositing a mino acid molecules or their derivatives on a gold...
Transient absorption spectroscopy has been extensively used in recent years to examine the temporal response of isolated nanoparticles (NPs) to the absorption of light [1]. These studies are largely based on the use of the surface plasmon resonance (SPR) to monitor characteristics of the NP such as electronic and lattice temperature, shape and morphology as a function of time. In the case of extended...
We report on quantitative measurements of the absolute heat flux between a gold coated near-field scanning thermal microscope (NSThM) [2] tip and a planar gold sample at nanometer distances of 0.2 nm–7 nm. After a precise calibration procedure we are able to measure the local heat transfer in a quantitative way [1]. We find an extraordinary large heat flux which is more than five orders of magnitude...
The optical properties of nanostructures with nonlocal effects is analysied by the finite element method method. The nonlocal effects can be described by a spatially nonlocal dielectric function with Drude model plus two Lorentz pole oscillator dielectric model. The optical properties of Au nanotubes with different radii, distance of junctions, can be determined by tuning the corresponding parameters...
During the last decade, many efforts have been made to develop techniques to integrate nanostructures in functional matrices. This activity, mainly boosted by advances in nanofabrication, has enabled the development of elegant methods for the development of planar nanodevices. However, the design and implementation of embedded three-dimensional (3D) nanoarchitectures with tunable spatial orientation...
Nano antennas have been proved to be a good platform to tune the emission properties of a localized source, e.g., an electric dipole [1]. Besides the enhancement of the emission efficiency, it is also feasible to control the radiating directivity of a dipole by utilizing the plasmon modes of these antennas. Here we show that both the forward and backward unidirectional radiation can be realized by...
The article presents results of numerical modelling of planar resonators arrays deigned for THz frequencies. The increase in the resonant frequency of each array's element is achieved by down-scalling its dimensions. Accompanying effects, as the rise of resistive metal losses are examined also. The presented results have shown the possibilities of down-scalling the geometry of basic planar resonators...
Recently, the solution-processable material organometal halide perovskites have attracted great attention for the properties of excellent charge carrier mobility, high photoluminescence quantum efficiency (PLQE) and the possibility of low-cost, scalable fabrication of lightweight and flexible devices [1]. In particular, the flexibility of the PLEDs becomes a very attractive feature and has potential...
In quantum physics it is well known that the spin of a particle can determine its motion: this is known as spin-orbit interaction. It is not so well known that Maxwell's equations can show the same effect with electromagnetic radiation. Contrary to the approximate assumptions of ray optics, in which rays propagate independently of light polarization, Maxwell's equations tell us that the spin of photons...
Optical microscopy is one of the most important scientific achievements in the history of mankind, and it is the most widely used technique for exploring the small world. However, as is well known, traditional lens-based optical microscopes suffer from the low imaging resolution λ/2 due to the diffraction limit. To overcome this obstacle, multiple innovative methods have been proposed during the past...
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