Controlling the photon absorption characteristics in avalanche photodetectors for high resolution biomedical imaging

Cesar Bartolo-Perez, Soroush Ghandiparsi, Ahmed S. Mayet, Ahasan Ahamed, Wayesh Qarony, Hilal Cansizoglu, Yang Gao, Shih Yuan Wang, Simon R. Cherry, M. Saif Islam, Gerard Ariño-Estrada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Improving the time resolution and sensitivity of Silicon-based Single Photon Avalanche Photodetectors (Si-SPAD) across the entire visible spectrum is critical to improve image quality in biomedical imaging applications such as positron emission tomography or fluorescence lifetime imaging. This work reports on the feasibility of manipulating penetration depth of photons with 450 nm wavelengths to enhance absorption in Si-SPAD by means of photon trapping structures. Optical-electrical simulations suggest light can be directed towards critical regions of the semiconductor increasing the absorption from 54 to 90% with only 1.2μm of silicon and enhancing the probability of avalanche by electrons that leads to higher multiplication gain and speed of operation.

Original languageEnglish (US)
Title of host publicationNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII
EditorsDror Fixler, Ewa M. Goldys, Sebastian Wachsmann-Hogiu
PublisherSPIE
ISBN (Electronic)9781510641518
DOIs
StatePublished - 2021
EventNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII 2021 - Vierual, Online, United States
Duration: Mar 6 2021Mar 11 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11658
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVIII 2021
Country/TerritoryUnited States
CityVierual, Online
Period3/6/213/11/21

Keywords

  • Avalanche photodetectors
  • PET
  • Photon-trapping
  • Time of Flight

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Controlling the photon absorption characteristics in avalanche photodetectors for high resolution biomedical imaging'. Together they form a unique fingerprint.

Cite this