Electrode-free photonic electric field sensor on thin film lithium niobate with high sensitivity

Author:

Xue Yu1,Ruan Ziliang1,Liu Liu1ORCID

Affiliation:

1. Zhejiang University

Abstract

A high-sensitivity electrode-free photonic electric field (E-field) sensor is introduced on a thin film lithium niobate (TFLN) platform. An integrated Michelson interferometer, constructed by low-loss etched lithium niobite (LN) waveguide structures, is implemented as the sensing element. The sensing arms are designed in a spiral shape, which facilities a long interaction length with the external E-field in a small chip area. A minimal detectable E-field amplitude of 8.43 mV/m/Hz1/2 is experimentally obtained. The metal-electrode-free design of the proposed device avoids affecting the E-field to be measured and enables a vectorial response with a measured extinction ratio (ER) of 38 dB.

Funder

National Natural Science Foundation of China

Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang

Fundamental Research Funds for the Central Universities

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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