scholarly journals Tight focus and field enhancement of terahertz waves using a probe based on spoof surface plasmons

2020 ◽  
Vol 69 (5) ◽  
pp. 054201
Author(s):  
Xiao-Lei Wang ◽  
Jie-Hui Zhao ◽  
Miao Li ◽  
Guang-Ke Jiang ◽  
Xiao-Xue Hu ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Field Enhancement ◽  
Terahertz Waves ◽  
Tight Focus

Highly sensitive electro-optic sampling of terahertz waves using field enhancement in a tapered waveguide structure

2014 ◽  
Vol 7 (11) ◽  
pp. 112401 ◽  
Author(s):  
Satoshi Tsuzuki ◽  
Daiki Takeshima ◽  
Tomoya Sakon ◽  
Tetsuya Kinoshita ◽  
Tomohiro Nagase ◽  
...  
Keyword(s):  
Field Enhancement ◽  
Waveguide Structure ◽  
Terahertz Waves ◽  
Electro Optic ◽  
Tapered Waveguide ◽  
Highly Sensitive

Anomalous field enhancement from the superfocusing of surface plasmons at contacting silver surfaces

2002 ◽  
Vol 91 (5) ◽  
pp. 2965-2968 ◽  
Author(s):  
A. A. Lalayan ◽  
K. S. Bagdasaryan ◽  
P. G. Petrosyan ◽  
Kh. V. Nerkararyan ◽  
J. B. Ketterson
Keyword(s):  
Surface Plasmons ◽  
Field Enhancement ◽  
Anomalous Field ◽  
Silver Surfaces

Plasmonics for Nanoimaging and Nanospectroscopy

2013 ◽  
Vol 67 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Satoshi Kawata
Keyword(s):  
Surface Plasmons ◽  
Noble Metals ◽  
Slow Light ◽  
Near Field ◽  
Field Enhancement ◽  
Historical Overview ◽  
Light Effect ◽  
Photon Confinement ◽  
Plasmon Polaritons ◽  
Effect Of Surface

The science of surface plasmon polaritons, known as “plasmonics,” is reviewed from the viewpoint of applied spectroscopy. In this discussion, noble metals are regarded as reservoirs of photons exhibiting the functions of photon confinement and field enhancement at metallic nanostructures. The functions of surface plasmons are described in detail with an historical overview, and the applications of plasmonics to a variety of industry and sciences are shown. The slow light effect of surface plasmons is also discussed for nanoimaging capability of the near-field optical microscopy and tip-enhanced Raman microscopy. The future issues of plasmonics are also shown, including metamaterials and the extension to the ultraviolet and terahertz regions.

Scanning Probe Microscopy of Surface Plasmons

1997 ◽  
Vol 11 (21) ◽  
pp. 2465-2510 ◽  
Author(s):  
Igor I. Smolyaninov
Keyword(s):  
Surface Plasmons ◽  
Local Field ◽  
Electromagnetic Waves ◽  
Light Emission ◽  
Near Field ◽  
Field Enhancement ◽  
Weak Localization ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

Recent development of novel scanning probe techniques such as Scanning Tunneling Microscopy (STM), Atomic Force Microscopy (AFM), and Near-Field Optical Microscopy (NFOM) has opened new ways to study local field distribution of surface electromagnetic waves. A lot of experimental efforts have been concentrated on the study of surface plasmons (SP). Different techniques allow to excite and probe SPs with wavelengths from 1 nm down to the optical range along its entire dispersion curve. Large number of phenomena have been studied directly, such as SP scattering by individual defects, strong and weak localization of SP, SP induced local field enhancement, light emission from the tunneling junction, etc. Scanning probe techniques allow not only topography and field mapping but also surface modification and lithography on the nanometer scale. Combination of these features in the same experimental setup proved to be extremely useful in SP studies. For example, some prototype two dimensional optical elements able to control SP propagation have been demonstrated.

High-density metallic nanogap arrays for the sensitive detection of single-walled carbon nanotube thin films

2015 ◽  
Vol 178 ◽  
pp. 195-201 ◽  
Author(s):  
Hyeong-Ryeol Park ◽  
Seon Namgung ◽  
Xiaoshu Chen ◽  
Sang-Hyun Oh
Keyword(s):  
Carbon Nanotubes ◽  
Strong Field ◽  
Electromagnetic Coupling ◽  
Field Enhancement ◽  
Single Walled Carbon Nanotubes ◽  
Atomic Layer ◽  
Terahertz Waves ◽  
Single Walled Carbon ◽  
Bare Glass Substrate ◽  
Walled Carbon Nanotubes

We have investigated the extraordinary optical transmission of terahertz waves through an array of nanogaps with varying dimensions and periodicities, and used this platform to demonstrate terahertz sensing of a thin film of single-walled carbon nanotubes. We have used atomic layer lithography to fabricate periodic arrays of nanogap loops that have a gap size of 2 nm and a loop length of 100 μm (aspect ratio of 50 000). These sub-mm-scale loops of nanogaps can sustain terahertz electromagnetic resonances along the contour. We have characterized the transmission of terahertz waves through the nanogap arrays and investigated the influence of inter-gap electromagnetic coupling as the array periodicity shrinks from 100 μm to 4 μm. While the gaps occupy only 0.1% of the surface area, we have measured an amplitude (|E|) transmittance of over 50% due to the strong and broadband field enhancement inside the nanogaps. The absolute transmission through the 2 nm gaps along the rectangular loops can be boosted up to 25%, while it is only 1% for annular gaps with the same perimeter. Furthermore, the extremely tight field confinement and strong field enhancement near the 2 nm gap lead to 43% extinction of THz waves in a 10 nm-thick film of single-walled carbon nanotubes over the gaps. On the other hand, THz extinction by the same nanotube film on a bare glass substrate is only 2%. These nanogaps pave the way toward developing sensitive terahertz detectors for biological and chemical targets.

scholarly journals A Tunable Triple-Band Near-Infrared Metamaterial Absorber Based on Au Nano-Cuboids Array

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 207 ◽  
Author(s):  
Feng Qin ◽  
Zeqiang Chen ◽  
Xifang Chen ◽  
Zao Yi ◽  
Weitang Yao ◽  
...  
Keyword(s):  
Surface Plasmons ◽  
Near Infrared ◽  
Structural Parameters ◽  
Fdtd Method ◽  
Field Enhancement ◽  
Metamaterial Absorber ◽  
Infrared Band ◽  
Perfect Absorption ◽  
Tunable Metamaterial ◽  
Triple Band

In this article, we present a design for a triple-band tunable metamaterial absorber with an Au nano-cuboids array, and undertake numerical research about its optical properties and local electromagnetic field enhancement. The proposed structure is investigated by the finite-difference time domain (FDTD) method, and we find that it has triple-band tunable perfect absorption peaks in the near infrared band (1000–2500 nm). We investigate some of structure parameters that influence the fields of surface plasmons (SP) resonances of the nano array structure. By adjusting the relevant structural parameters, we can accomplish the regulation of the surface plasmons resonance (SPR) peaks. In addition, the triple-band resonant wavelength of the absorber has good operational angle-polarization-tolerance. We believe that the excellent properties of our designed absorber have promising applications in plasma-enhanced photovoltaic, optical absorption switching and infrared modulator optical communication.

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