Work

Cascaded hollow FP cavities on fiber end-face for ultrasonic and photoacoustic detection

Year: 2025

Type: article

Abstract: For photoacoustic (PA) detectors, compact form factor, exceptional sensitivity, broad bandwidth, and omnidirectional responsiveness are crucial performance indicators. In this research, we introduce what we believe to be a novel cascaded hollow Fabry-Pérot (CH-FP) interferometric PA sensor fabricated via two-photon polymerization (TPP), which is based on single-mode optical fiber architecture. Featuring a micron-scale transverse dimension of 120μm, the device demonstrates a bandwidth exceeding 30 MHz, minimum detectable pressure of 0.58 Pa/Hz^(1/2) at 1 MHz, and an -3 dB angular response uniformity within ±90. The monolithic integration of optical readout and microfabrication scalability positions this technology as a promising candidate for next-generation PA tomography and endoscopy applications.

Source: Optics Express

DOI: 10.1364/oe.581171

Authors: Chao Zhao, Kaixiong Shao, Han Lei, Chonglei Zhang

Language: English

Topic: Advanced Fiber Optic Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Natural Science Foundation of China

Award: G8333517111