Design rules for optical Tamm plasmon refractive index sensor based on porous-GaN

Partha Sona Maji, Gayatri Banerjee, Saraswat Acharyya, Amit Ranjan Maity

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We investigated the realization of optical Tamm states (OTS) based on a unique DBR consisting of GaN and porous-GaN(pGaN) towards sensing characteristics for the visible part of the wavelength window. We detailed the dependency of the structural parameters that includes the metal thickness, porosity of the nanoporpus layers, the indices of the filling medium into the porous region and different way of launching of light on the structure. Some interesting observations on the realization of the OTS based on porosities are observed which was utilized towards realizing a refractive index sensor for different constituents of the porous part. We could achieve a reasonable spectral sensitivity of ~ 13 nm/RIU along with a high DA of 0.57 nm−1 giving rise to a QF of more than 260 with a figure of merit ~ 7.5/RIU for 50% of the porosity. We also observed that higher sensitivity both in terms of spectral and amplitude can be achieved with higher porosities. The detections accuracy, quality factor and figure of merit for different porosities are all investigated which will be very useful for different active and passive optoelectronic devices based on nanoporous medium in the future studies.

Original languageEnglish
Article number623
JournalOptical and Quantum Electronics
Issue number10
StatePublished - 23 Aug 2022


  • Braggs reflector
  • Figure of merit
  • FWHM
  • Optical sensor
  • Optical Tamm plasmons
  • Plasmonics
  • Quality factor
  • Sensitivity

ASJC Scopus subject areas

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


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