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Self-Powered Lithium Niobate Thin-Film Photodetectors
Xiaoli Sun1, Yan Sheng2, Xu Gao1
1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 17, 2022
Summary
This study presents a self-powered lithium-niobate-on-insulator (LNOI) photodetector. Enhanced photovoltaic effects from plasmonic nanoparticles and silver ions overcome conductivity issues for integrated photonics.
Area of Science:
- Integrated Photonics
- Materials Science
- Optoelectronics
Background:
- The lithium-niobate-on-insulator (LNOI) platform offers unique advantages for integrated photonics.
- Existing LNOI devices lack efficient thin-film photodetectors due to low conductivity and poor photoelectric conversion.
Purpose of the Study:
- To develop a high-performance, self-powered, broadband LNOI photodetector.
- To address the limitations of current LNOI photodetector technology.
Main Methods:
- Fabrication of an LNOI photodetector incorporating encapsulated plasmonic nanoparticles and doped silver ions.
- Utilizing enhanced photovoltaic effects for photodetection.
- Employing first-principle calculations and electric-field simulations to understand mechanisms.
Main Results:
- Achieved maximum responsivity of 0.25 A/W.
- Reached a detectivity of 1.56 × 10^14 Jones.
- Demonstrated the crucial roles of plasmonic nanoparticles and silver ions in photocurrent generation and collection.
Conclusions:
- The developed LNOI photodetector exhibits excellent performance, overcoming previous limitations.
- This work paves the way for advanced, multifunctional photonic circuits based on LNOI.
- The findings offer a viable path toward high-performance on-chip LNOI photodetectors.
