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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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A Single-Pixel Event Photoactive Device for Real-Time, In-Sensor Spatiotemporal Optical Information Processing.

Mohit Kumar1,2, Hayoung Park2, Hyungtak Seo1,2

  • 1Department of Materials Science and Engineering, Ajou University, Suwon, 16499, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|August 22, 2024
PubMed
Summary

A novel single-pixel photodetector integrates spatiotemporal event sensing and memory for ultrafast, low-energy optical pattern recognition. This device enables in-sensor processing, advancing compact and efficient photonic applications.

Keywords:
event sensing photoactive devicein‐sensor processingshort‐term memoryspatiotemporalultralow energy

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Area of Science:

  • Photonics and Optoelectronics
  • Sensor Technology
  • Materials Science

Background:

  • Growing demand for energy-efficient optical sensing necessitates advancements in spatiotemporal information processing.
  • Traditional multi-pixel arrays and event cameras struggle with real-time, high-dimensional spatiotemporal data, causing latency and high energy consumption.
  • Need for integrated, in-sensor processing to overcome limitations of external data handling.

Purpose of the Study:

  • To introduce a carrier-selective, single-pixel, position-sensitive photoactive device with integrated spatiotemporal event sensing and short-term memory.
  • To demonstrate in-sensor parallel optical information processing capabilities.
  • To enable ultrafast pattern recognition and optical flow detection at the single-pixel level.

Main Methods:

  • Development of a novel single-pixel, position-sensitive planar photoactive device.
  • Integration of carrier-selective properties for enhanced functionality.
  • Implementation of short-term memory for in-sensor data processing.
  • Testing with varying light illumination (continuous and pulsed) to assess pattern recognition and trajectory detection.

Main Results:

  • The single-pixel device achieved ultrafast (≈0.4 µs) recognition of input patterns with low energy consumption (25 fJ).
  • Demonstrated efficient, simultaneous processing of multibit (>4 bit) data.
  • Enabled in-sensor optical flow detection and trajectory tracking by adjusting operating speed.
  • Proof-of-concept device successfully integrated spatiotemporal sensing and memory.

Conclusions:

  • This single-pixel event photodetector represents a significant advancement for compact, energy-efficient, and ultrafast sensing.
  • The device facilitates in-sensor parallel optical information processing, overcoming limitations of traditional systems.
  • Paves the way for next-generation photonic applications requiring real-time, high-dimensional data handling.