Optical properties of porous silicon Thue‐Morse structures

Stefano, Luca De; Rea, Ilaria; Rotiroti, Lucia; Moretti, Luigi; Rendina, Ivo

doi:10.1002/pssc.200674342

Cited by 3 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on this, TMS-based devices have been explored for various unique applications such as development of narrowband filters 23 and omnidirectional reflectors 24 , 25 . Researchers have examined the physical characteristics of TMS-based devices, including the transmission characteristics of TMS ternary plasma PhCs, 26 two-dimensional TMS, 27 porous silicon TMS, 28 photonic quasi-crystal fiber based on the TMS, 29 Thue–Morse ordered superconducting PhCs, 30 and multicomponent TMS 31 . However, less work is carried out to distinguish the localization feasibility of various optical interface edge-states at oblique incidence angles in these disordered photonic structures, especially Thue–Morse sequence-based systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of interface mode localization in disordered photonic crystal structure

2022

View full text Add to dashboard Cite

A disordered photonic crystal (D-PhC) structure is analyzed to study the interface mode localization characteristics. The design comprises a bilayer-disordered PhC structure, where layers are arranged in Thue-Morse sequence (TMS). The impact of local symmetric substructures on eigenstates coupling is also considered over a wider wavelength range. The mode hybridization study is carried out for varying refractive index contrast values of TMS structures at an operating wavelength of 550, 632.8, and 750 nm, respectively. The dispersion analysis confirms the localization of bulk guided, and edge-guided modes for different incidence angles at the structural local resonators. Further, increasing the RI contrast value leads to generation of hybrid interface modes of very high electric field intensity. Thus, showing its potential applications in both sensing and light guiding applications. Moreover, because of the higher surface electric field intensity this structure can also be used for fluorescence-based detection and surface-enhanced Raman spectroscopy as well.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of interface mode localization in disordered photonic crystal structure

2022

View full text Add to dashboard Cite

show abstract

Optical filters based on fixed length Thue–Morse plasma-dielectric photonic band multilayers: Comparing two, three, and four materials systems

2021

View full text Add to dashboard Cite

In this paper, we study the optical filtering properties of plasma-dielectric photonic crystals based on Thue–Morse multilayers. The method of generating the Thue–Morse sequence used in the current paper is different from that used in the available literature. We fix the total multi-material system length and use two, three, and four alternative layers of materials with different refractive indices to study the optical transmission properties of a few proposed structures. We also use plasma layers to have more tunable bandgaps. We employ the transfer matrix method to do our numerical calculations. We change the geometrical parameters, the number of layers, the arrangement of the layers, material refractive indices, and plasma properties and extract their effects on the bandgap behavior. We determine the tunability of the proposed structures to facilitate the selection of the one with desired filtering properties. However, understanding the tunability of our systems can facilitate the devising of optical devices such as an optical filter.

show abstract