Surface Plasmons in Light Interaction With Metallic Nanostructures and Applications

2008 ◽  
Author(s):  
Li-Hsin Han ◽  
Arvind Battula ◽  
Shaochen Chen
Keyword(s):  
Surface Plasmons ◽  
Finite Difference Time Domain ◽  
Light Field ◽  
Metallic Nanostructures ◽  
Gold Nanospheres ◽  
Polymer Shell ◽  
Light Enhancement ◽  
Gold Nanosphere ◽  
Difference Time ◽  
Light Interaction

In this invited paper, we present the surface plasmons effect as a result of light interaction with metallic nanostructures such as a gold nanosphere or an array of gold nano-slits. Numerical simulation using a finite difference time domain method coupled with Drude model revealed the light enhancement near the gold nanostructures due to the surface plasmon effect. Experimentally, we demonstrated such effect in laser deformation of a polymer shell coated with gold nanospheres. We also employed such enhanced light field for nanoscale lithography.

scholarly journals Subwavelength probing of surface plasmons in magnetoplasmonic crystals

2021 ◽  
Vol 2015 (1) ◽  
pp. 012041
Author(s):  
Aleksandr Yu Frolov ◽  
Niels Verellen ◽  
Victor V Moshchalkov ◽  
Andrey A Fedyanin
Keyword(s):  
Finite Difference ◽  
Surface Plasmons ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Near Field ◽  
Normal Incidence ◽  
Scattered Intensity ◽  
Wave Source ◽  
One Dimensional ◽  
Difference Time

Abstract In this work, we report on near-field studying of propagating surface plasmons (SPs) in one-dimensional magnetoplasmonic crystals (MPCs) by aperture type scanning near-field optical microscopy (SNOM). Optical near-field around the aperture probe is used to drive SPs in the MPC locally. The SNOM signal represents the scattered intensity caused by the interaction of the SNOM probe near-field with the MPC. Scanning the MPC surface with polarization resolving of the scattered radiation shows decreasing of the intensity due to the SP excitation. The observed polarization dependence of the scattered SNOM signal is associated with the selective coupling of the near-field components of the SNOM probe with SPs. Finite-difference time-domain simulations reproduce the experimental SNOM signal. It is shown the excitation of SPs with symmetric (even parity) field distribution, which is forbidden for plane wave source at normal incidence.

Optical Properties of Two Malposed Silver Triangular Nanocylinder Arrays

2014 ◽  
Vol 548-549 ◽  
pp. 182-186
Author(s):  
Zheng Jie Cai ◽  
Gui Qiang Liu ◽  
Zheng Qi Liu ◽  
Xiang Nan Zhang ◽  
Ying Hu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Finite Difference ◽  
Surface Plasmons ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Localized Surface Plasmons ◽  
Plasmonic Nanostructure ◽  
Potential Applications ◽  
Difference Time

We propose and theoretically study a novel plasmonic nanostructure composed of two malposed silver (Ag) triangular nanocylinder arrays by the finite-difference time-domain (FDTD) method. The excitation of the localized surface plasmons (LSPs) of the metal triangular nanocylinders, and the strong interaction coupling between LSPs contribute to the enhanced transparency in the visible and near-in region (NIR). The transparency response in the proposed nanostructure is modified by changing the gap distances between two adjacent triangular nanocylinders, and the dielectric environments. The tunable enhanced optical transparency of the proposed nanostructure provides potential applications in sensors and plasmonic filters.

A STRUCTURE FOR COUPLING WHISPERING GALLERY MODE WITH SURFACE PLASMONS

2010 ◽  
Vol 19 (04) ◽  
pp. 811-817
Author(s):  
KENZO YAMAGUCHI ◽  
MASAMITSU FUJII ◽  
MITSUO FUKUDA
Keyword(s):  
Surface Plasmons ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Silver Film ◽  
Three Dimensional ◽  
Whispering Gallery Mode ◽  
Silica Microsphere ◽  
Whispering Gallery ◽  
Novel Structure ◽  
Difference Time

The three-dimensional finite-difference time-domain method was used to demonstrate a novel structure for coupling whispering gallery mode (WGM) with surface plasmons (SPs). As for this structure, a micrometer-sized optical resonator composed of a silver film coated on a silica microsphere containing apertures is set on a glass substrate. The SPs couple with higher-order WGM, and their intensity is clearly enhanced by this structure.

Compact and ultrafast all optical 1-bit comparator based on wave interference and threshold switching methods

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asghar Askarian
Keyword(s):  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Logical Structure ◽  
Ring Resonators ◽  
Plane Wave Expansion ◽  
Threshold Switching ◽  
Wave Interference ◽  
All Optical ◽  
Fdtd Methods ◽  
Difference Time

Abstract In this study, we are going to design all optical 1-bit comparator by combining wave interference and threshold switching methods. The final structure composed of two nonlinear ring resonators and seven waveguides. The functionality of the suggested logical structure is analyzed and simulated by using plane wave expansion (PWE) and finite difference time domain (FDTD) methods. According to results, the proposed all optical 1-bit comparator has faster response and smaller footprint than all previous works. The maximum ON-OFF contrast ratio, delay time and area of the suggested optical comparator are about 16.67 dB, 1.8 ps, and 513 µm2, respectively.

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