Affiliation:
1. The Key Laboratory of Weak‐Light Nonlinear Photonics Ministry of Education School of Physics and TEDA Applied Physics Institute Nankai University Tianjin 300071 P. R. China
2. Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 P. R. China
Abstract
AbstractDespite various successes in lithium niobate (LN) integrated photonic devices (e.g., light sources, waveguides, modulators, etc.), LN photodetectors (PD) that converts light into electrical signals have received less research attention. Here, fast LN PDs are demonstrated. Defect energy states are used within the forbidden band of the LN as electron donor centers to generate free carriers in the conduction band under optical excitation in the visible range. Compared with previous pyroelectric LN PDs whose response speeds are normally limited to the order of 100 Hz, these LN PDs show faster responses up to 10 kHz. The dependences of the PDs' performances on the electrode gap, external driving voltage, illumination power, and impurity dopants are also studied. This work provides a step toward high‐performance LN PDs for constructing monolithic full‐functional integrated LN photonic chips.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Higher Education Discipline Innovation Project
Fundamental Research Funds for the Central Universities
Subject
Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials