Tunable resonance transmission modes in hybrid heterostructures based on porous silicon

Karina S Pérez,Antonio Méndez-Blas,J Octavio Estevez,Miguel E Mora-Ramos,Gabriela Palestino,Jesús Arriaga

doi:10.1186/1556-276x-7-392

Abstract

In this work, we report the experimental results and theoretical analysis of strong localization of resonance transmission modes generated by hybrid periodic/quasiperiodic heterostructures (HHs) based on porous silicon. The HHs are formed by stacking a quasiperiodic Fibonacci (FN) substructure between two distributed Bragg reflectors (DBRs). FN substructure defines the number of strong localized modes that can be tunable at any given wavelength and be unfolded when a partial periodicity condition is imposed. These structures show interesting properties for biomaterials research, biosensor applications and basic studies of adsorption of organic molecules. We also demonstrate the sensitivity of HHs to material infiltration.

Highlights

Photonic crystals are attractive optical materials to control and manipulate the flow of light
Localized modes can appear into the PBGs by breaking the periodicity of the dielectric multilayer, i.e., by introducing a defect into a photonic crystal (PC) [4] that allows a narrow range of light wave frequencies to propagate through the whole structure
Unlike the first simulations and as a result of changes in the effective refractive index produced by thermal oxidation and APTES infiltration, we introduced a constant ni in order to reproduce the best possible experimental reflectance, where i corresponds to layers A, B, C and D

Summary

Introduction

Photonic crystals are attractive optical materials to control and manipulate the flow of light. A periodic dielectric system (multilayered), typically consisting of two alternated dielectric materials with periodic variation of refractive index (n), is the simplest photonic crystal (PC) [1]. The propagation of electromagnetic radiation in PCs is forbidden in specific wavelength ranges (photonic band gaps or PBGs) because the light wave is scattered at the layers’ interfaces, so the multiple-scattered waves interfere destructively into the material [2]. Localized modes can appear into the PBGs by breaking the periodicity of the dielectric multilayer, i.e., by introducing a defect into a PC [4] that allows a narrow range of light wave frequencies to propagate through the whole structure. The defect is a single layer with different optical parameters (refractive index or thickness) or a completely different

Methods

Results

Conclusion