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Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Published on: June 23, 2018

Light field image sensors based on the Talbot effect.

Albert Wang¹, Patrick Gill, Alyosha Molnar

¹School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.

|November 3, 2009

Summary

This study introduces a novel pixel-scale sensor utilizing the Talbot effect for precise light detection. The sensor accurately measures light intensity and incident angle without additional optics, enabling 3D source localization.

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Area of Science:

Optics and Photonics
Sensor Technology
Diffractive Optics

Background:

Accurate measurement of light intensity and angle is crucial for various applications.
Existing methods for light detection can be complex and require additional optical components.
The Talbot effect offers a unique physical phenomenon for optical sensing applications.

Purpose of the Study:

To develop a pixel-scale sensor for detecting local light intensity and incident angle.
To demonstrate the use of the Talbot effect for angle-dependent light modulation.
To enable 3D light source localization using an array of these sensors.

Main Methods:

Fabrication of a sensor comprising two stacked diffraction gratings above a photodiode.
Utilizing the Talbot effect for self-imaging of light patterns.
Tuning multiple sensor structures to different incident angles for angle extraction.
Arranging sensor arrays for spatial light source localization.

Main Results:

The sensor successfully detects local light intensity and incident angle.
The second grating modulates light based on incident angle at the Talbot depth.
Arrays of sensors achieve 3D localization of light sources.
The system operates without the need for additional optical elements.

Conclusions:

The developed Talbot effect sensor provides a compact and effective solution for light intensity and angle measurement.
This technology enables precise 3D localization of light sources.
The sensor's design offers potential for miniaturization and integration into various optical systems.