Efficient Design Method for Plasmonic Filter for Tuning Spectral Selectivity

Yun Seon Do

doi:10.3390/cryst10060531

Abstract

Nano-structure-based color technologies have been reported as alternatives for conventional pigment- or dye-based color filters due to their simple design methods and durable characteristics. Since structure-based optical resonances accompany multiple resonance modes, spectral selectivity could be degraded. In this work, a simple and effective design of a plasmonic color filter that combines the plasmonic filter with one-dimensional photonic crystals. The introduced photonic crystal provides a photonic band gap, and it helps in suppressing the undesirable transmission peaks of the plasmonic color filter that originates from higher order resonance modes. Finally, the proposed design achieves high color purity. In addition, the simplicity of the design makes it both suitable for large-area fabrication and cost effective. This work is expected to provide a practical alternative to traditional color filters.

Highlights

With the rapid progress in nanofabrication, various phenomena occurring in sub-micron structures are being researched and reported, leading to advances in the application of nanostructures in various devices [1,2,3,4,5]
A novel plasmonic color filter that works in conjunction with a 1b. One-dimensional (1D) photonic crystal (PhC) structure was proposed
In the finitely stacked multilayer, which does not form a complete photonic band gap (PBG), the spectral valley is observed in the PBG band, and ripples are observed around the spectral range from 500 nm to 700 nm

Summary

Introduction

With the rapid progress in nanofabrication, various phenomena occurring in sub-micron structures are being researched and reported, leading to advances in the application of nanostructures in various devices [1,2,3,4,5]. The power intensity of this EM field falls exponentially with increasing distance from the interface, and the wave propagates in a tangential direction to the surface. This unique EM wave is referred to as the surface plasmon (SP). The SPs are used by themselves or enhance other optical mechanisms such as absorption, scattering, emission, etc., which occur in the surroundings. From these points of view, plasmonic applications have been frequently explored for optical or photonic devices [6,7,8,9]. When SP resonance occurs in the visible range, plasmonic devices can be used as chromatic devices with selective spectral characteristics [10,11,12]

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Conclusion