Application of microgels for optical tagging

J. Michael Cathcart, L. Andrew Lyon, Marcus Weck, Robert D. Bock

Research output: Contribution to journalConference articlepeer-review


In this paper we present results from our research into the use of microgel-based photonic crystals in an optical tagging application. The basis for this research is the phenomena of self-assembly of hydrogel nano- and microparticles (i.e., microgels) into colloidal crystal Bragg reflectors. Previous research has demonstrated the assembly of Bragg structures that are sensitive in the visible spectral region. This current research focuses on the extension of this process into the infrared regime and the use of these infrared-sensitive structures in the creation of an optical tag. In particular, the research effort emphasizes two primary areas: the development of nanoparticles that are infrared-sensitive and the casting of thin films comprised of these particles. We will also present theoretical data on the optical and physical characteristics of thin films comprised of these particles. This paper will present an overview of the program, outline the processes and issues addressed during our initial efforts in creating these infrared sensitive structures and present a summary of the computational results based on the theoretical analyses.

Original languageEnglish (US)
Pages (from-to)774-781
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 2
StatePublished - 2004
EventSensors, and Command, Control, Communications, and Intelligence (C31) Technologies for Homeland Security and Homeland Defense III - Orlando, FL, United States
Duration: Apr 12 2004Apr 16 2004


  • Bragg reflection
  • Microgels
  • Optical tagging
  • Photonic crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Application of microgels for optical tagging'. Together they form a unique fingerprint.

Cite this