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Related Experiment Video

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Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Published on: June 23, 2018

Flat-top steep-edge photodetector with cascaded grating structure.

Xu Zhang¹, Yongqing Huang, Xiaomin Ren

¹Key Laboratory of Information Photonics and Optical Communications, Ministry of Education,Beijing University of Posts and Telecommunications, Beijing 100876, China. zhangxubetter@gmail.com

|December 17, 2009

Summary

A novel photodetector design uses cascaded waveguide grating filters, improving spectral response. This innovation offers a narrower, more efficient response with fewer layers than traditional designs.

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Area of Science:

Optoelectronics
Photonics
Materials Science

Background:

Traditional photodetectors often use distributed Bragg reflectors, which can be complex and require numerous layers.
Achieving a narrow, flattop spectral response with high efficiency and low sidebands is crucial for advanced photodetector applications.

Purpose of the Study:

To propose and analyze a new photodetector architecture utilizing cascaded waveguide grating filters.
To demonstrate the enhanced spectral response achievable by integrating waveguide gratings into photodetector designs.

Main Methods:

Simulations and calculations were performed for single, double, and triple cascaded grating filter structures.
The proposed waveguide grating design was integrated into classical thin-film homogeneous layers.
Performance was compared against traditional photodetectors employing distributed Bragg reflectors.

Main Results:

Cascading two or three grating filters resulted in an increasingly rectangular spectral response.
The new design achieved a narrow flattop response, high peak efficiency, and low sideband reflectance.
Significantly fewer layers were required compared to distributed Bragg reflector-based photodetectors using identical materials.

Conclusions:

Cascaded waveguide grating filters offer a superior alternative to distributed Bragg reflectors in photodetector design.
This approach enables enhanced spectral control and improved performance metrics with reduced structural complexity.
The proposed photodetector design holds promise for next-generation optoelectronic devices requiring precise spectral selectivity.