Multiwavelength optical sensor based on a gradient photonic crystal with a hexagonal plasmonic array

Lina Dedelaite, Raul D. Rodriguez, Benjamin Schreiber, Arunas Ramanavicius, Dietrich R.T. Zahn, Evgeniya Sheremet

Research output: Contribution to journalArticle

Abstract

Sensitivity and versatility are characteristics that make a sensor device attractive for wide-spread applications in everyday life. Surface-enhanced Raman spectroscopy (SERS) is capable of providing the highest sensitivity, that of single-molecule detection, and excellent specificity due to its fingerprinting capability. However, conventional SERS substrates must be optimized to operate for a particular excitation wavelength. Here in this work, we achieve for the first time multiwavelength amplification with a hybrid plasmonic/photonic heterostructure integrating a gradient photonic crystal and an Ag nanotriangle array. We demonstrate the detection of ultrathin molecular layers showing a signal amplification for the typical laser wavelengths used in Raman spectroscopy detection. By combining photonics and plasmonics in a single silicon chip, we expand multiwavelength- and spatially-selective ultra-sensitive detection to a wide range of applications from biomedicine to safety.

Original languageEnglish
Article number127837
JournalSensors and Actuators, B: Chemical
Volume311
DOIs
Publication statusPublished - 15 May 2020

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Keywords

  • Optical sensor
  • Photonic crystal
  • Photonics
  • Surface-enhanced Raman spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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