FDTD Modelling of Silver Nanoparticles Embedded in Phase Separation Interface of H-PDLC

Kun Gui,Kangni Wang,Jihong Zheng,Songlin Zhuang,Daoping Li

doi:10.1155/2015/298913

Abstract

We report localized surface plasmon resonance (LSPR) of silver nanoparticles (NPs) embedded in interface of phase separation of holographic polymer-dispersed liquid crystal (H-PDLC) gratings using Finite-Difference Time Domain method. We show that silver NPs exhibit double resonance peak at the interface, and these peaks are influenced by the angle of incident light. We observe a blue shift of the wavelength of resonance peak as the incident angle increases. However, the location of silver NPs at the interface has nearly no effect on the wavelength of resonance peak. Also we show near-field and far-field properties surrounding silver NPs and find that field distribution can be controlled through rotation of incident angle. Therefore, LSPR properties of silver NPs within H-PDLC gratings can be excited by appropriate wavelength and angle of the incident light.

Highlights

A large number of free electrons at the interior and surface of metal form free electron group, namely, plasma, and surface plasma refers in particular to the electron group existing at the surface
The simulation structure is the silver NPs with diameter of 50 nm uniformly embedded in the mixture consisting of acrylic monomer (EB8301, np = 1.5) and nematic LC (99.9% TEB50 + 0.1% CB15 mixed liquid crystal, ne = 1.7, no = 1.5) that is sandwiched between two pieces of glass substrate
The structure is shown in Figure 1: silver NPs uniformly embedded in the holographic polymer-dispersed liquid crystal (H-PDLC) grating excite Localized surface plasmon resonance (LSPR) and a monochromatic plane wave is vertically incident on the grating

Summary

Introduction

A large number of free electrons at the interior and surface of metal form free electron group, namely, plasma, and surface plasma refers in particular to the electron group existing at the surface. Structures and devices based on LSPR properties are attracting considerable attention as a result of their unique manipulation and control of photon at nanoscale size. It provides an effective road for nanophotonics devices and all-optical integration [1, 2]. It is well-known that resonance peak of LSPR can be controlled through geometrical size of metallic NPs and surrounding media [3,4,5,6]

Methods

Results

Conclusion