Abstract
Abstract
An integrated optical electric field (E-field) sensor based on a one-dimensional photonic crystal nanobeam cavity on a lithium niobite on insulator (LNOI) platform is reported here. It has a large dynamic range and extreme sensitivity. The dielectric resonant mode has a quality factor
Q
≳ 105. The waveguide-coupled structure, only 25 μm long, is beneficial for future on-chip integration. The use of TiO2 compensates for the thermo-optical effect of lithium niobite (LN), while the high dielectric constant of TiO2 influences the E-field distribution. A tri-layer TiO2/LNOI/TiO2 nanobeam structure is proposed to improve electro-optical modulation efficiency in LN. Detailed analysis of noise sources shows the theoretical minimum detectable E-field to be 0.15 V m−1 with a dynamic range of 83 dB. The temperature-induced resonant wavelength variation is within 3 pm °C−1 in the range of −40 °C to 40 °C.
Funder
National Natural Science Foundation of China
State Key Laboratory of Power System and Generation Equipment
National Key Research and Development Program of China
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
10 articles.
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