Investigating Opto-Electronic Properties of Surface Plasmon Structure for Spectroscopic Applications

Investigating Opto-Electronic Properties of Surface Plasmon Structure for Spectroscopic Applications

Pratibha Verma, Arpan Deyasi
Copyright: © 2019 |Pages: 61
DOI: 10.4018/978-1-5225-8531-2.ch010
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Abstract

This chapter is proposed with an approach to analyze reflectance as a function of negative index material thickness for different parameters under the surface plasmon condition and extended approach towards the field enhancement of electric field as function of incidence angle and transmittance as function of incidence angle has been analyzed. This chapter can reflect the good comparison between 3 layer medium and n layer medium model. Characteristic impedance of MIM surface plasmon structure is analytically calculated considering the effect of both Faraday inductance and kinetic inductance. Effect of metal layer thickness, insulator thickness, and electron density are tailored to observe the impedance variation with frequency. Wavelength dependence of characteristic impedance and quality factor of MIM (metal-insulator-metal) surface plasmon structure is analyzed. Structural parameters and damping ratio of the structure is tuned within allowable limit to analyze the variation after detailed analytical computation.
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Introduction

Plasmonic

Nowadays in communication system, larger amount of data with high speed are transferred based on either electronics or photonics. Advanced technology named as ‘plasmonics’ is the study of the interaction between electromagnetic field of light with free electrons in metal under specific conditions (Born & Wolf 1999; Kittel 1996). Plasmonic is helpful to transfer both optical and electronic data at faster rate. Free electrons in the metal surface does collective oscillation excited by electric field of the incident light (Wood 1902; Ritchie 1957). Moreover, due to ohmic losses and electron-core interactions, losses are unavoidable for the plasmon oscillation, which is usually deleterious to most plasmonic devices (Knoll 2000). By proper designing metal patterns, the oscillation of free electrons in the metal surface can be controlled and at the same time, the absorption of light at any specific wavelength can be enhanced greatly in the metal for surface plasmon (SP) excitation (Raether & Kretschmann 1968; Veselago 1968). Optimized design of Metal-Insulator-Metal (MIM) device can make it work in a wide-spectrum from infrared to visible.

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