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Microcavity- and Microlaser-Based Optical Barcoding: A Review of Encoding Techniques and Applications.

Abdur Rehman Anwar1, Maruša Mur1, Matjaž Humar2,3,1

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Optical microbarcodes, particularly spectral barcodes, offer robust and simple readout for diverse applications. Microcavity and microlaser technologies enable millions of unique codes for cell tracking and product labeling.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Optical microbarcodes are gaining traction for applications like multiplexed assays, cell tracking, and anticounterfeiting due to their unique properties.
  • Spectral barcodes are particularly advantageous due to their robustness and straightforward readout mechanisms.
  • Microcavity- and microlaser-based barcodes offer highly narrow spectra, enabling the generation of millions of unique identifiers.

Purpose of the Study:

  • This review focuses on microcavity-based optical barcodes.
  • It discusses various types of optical microbarcodes and their encoding principles.
  • The review also explores applications and future prospects of microcavity and microlaser barcodes.

Main Methods:

  • The review discusses different types of optical microbarcodes, with a specific emphasis on microcavity-based designs.
  • It details the use of whispering-gallery microcavities, nanowire lasers, Fabry-Pérot lasers, random lasers, and distributed feedback lasers.
  • Information encoding in microcavity barcodes is primarily based on the spectral properties of emitted light, influenced by microcavity characteristics like size, shape, and gain materials.

Main Results:

  • Microcavity-based barcodes encode information in emitted light properties, most commonly the spectrum.
  • The spectral characteristics are tunable by altering microcavity parameters such as size, shape, and gain materials.
  • Various microcavity and microlaser types are suitable for barcoding applications.

Conclusions:

  • Microcavity- and microlaser-based barcodes hold significant potential for generating a vast number of unique identifiers.
  • These advanced optical barcodes are applicable in fields ranging from biological research (cell tracking) to security (anticounterfeiting) and commercial use (product labeling).
  • Continued research into microcavity and microlaser technologies promises further advancements in optical barcoding.