Plasmonic Bragg reflectors based on metal-embedded MIM structure

Ming Tian, Ping Lu, Li Chen, Deming Liu, Nasser N Peyghambarian

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We propose and investigate a metalembedded metal-insulator-metal (MIM) structure plasmonic Bragg reflector (PBR) using the finite-difference time-domain (FDTD) method with PMLs (perfectly matched layers) boundary conditions. It improves the performance of conventional step profile MIM PBRs to some extent. Our numerical study reveals that the metal-embedded PBRs exhibit lower insertion loss, narrower bandgap, and reduced rippling in the transmission spectrum when compared with the step PBRs at the same normalized index contrast and transmission levels. The defect mode of the metal-embedded PBRs also exhibits higher transmission. To suppress the sidelobes in the transmission spectrum, we further smooth the end of the embedded metal, which demonstrates a better performance. Then, we find with respect to the Bragg wavelength, the longer wavelengths have a tendency to spread in the wider regions of the insulator layer; however, the shorter wavelengths have a tendency to spread in the embedded metal regions. The apodized PBRs with the embedded metal length decreasing (increasing) efficaciously suppress the ripples at the right (left) band edges. Then, we use the impedance theoretical model to explain this phenomenon. Finally, we realize a flat-top transmission band filter by connecting two apodized PBRs, and the band and center wavelength can be adjusted.

Original languageEnglish (US)
Pages (from-to)5122-5127
Number of pages6
JournalOptics Communications
Volume285
Issue number24
DOIs
StatePublished - Nov 1 2012

Fingerprint

Bragg reflectors
Metals
insulators
metals
Wavelength
wavelengths
tendencies
perfectly matched layers
sidelobes
Finite difference time domain method
Insertion losses
ripples
finite difference time domain method
insertion loss
Energy gap
Boundary conditions
impedance
boundary conditions
filters

Keywords

  • Bragg reflectors
  • Guided waves
  • Plasmonics
  • Surface plasmons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Plasmonic Bragg reflectors based on metal-embedded MIM structure. / Tian, Ming; Lu, Ping; Chen, Li; Liu, Deming; Peyghambarian, Nasser N.

In: Optics Communications, Vol. 285, No. 24, 01.11.2012, p. 5122-5127.

Research output: Contribution to journalArticle

Tian, Ming ; Lu, Ping ; Chen, Li ; Liu, Deming ; Peyghambarian, Nasser N. / Plasmonic Bragg reflectors based on metal-embedded MIM structure. In: Optics Communications. 2012 ; Vol. 285, No. 24. pp. 5122-5127.
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