Zunyue Zhang

Postdoctoral Fellow

The Chinese University of Hong Kong

Zunyue Zhang received the B.S. degree in physics from Nankai University, Tianjin, China in 2017, and the Ph.D. degree in electronic engineering from the Chinese University of Hong Kong, Shatin, Hong Kong, in 2021. S E lectronic E ngineering of he is now a postdoctoral fellow in the Chinese University of Hong Kong . department of Her research interests include silicon photonic integrated circuits and integrat tomography imaging systems . Her pre ed spectrometers for dynamic optical coherence vious work include integrated spectrometers on different integrated s int platforms coheren ce tomography system with integrate d spectro meters . egrated subwavelength devices, and spectral domain optical T in L he results aser & Photonics Reviews, ACS Photonics, Photonics Research, Technology, etc.

Integrated Spectrometers on Silicon Photonics Platform for Miniaturized and Portable Optical Coherence Tomography

Optical coherence tomography (OCT) is a well-established 3D imaging method and has the advantage of non-invasive imaging. OCT has applications in ophthalmology for obtaining 3D images of the retina, and in industry, OCT is used to assist in quality control processes. Nowadays, the OCT systems available in the market can offer millimeters of imaging depth and micro-level axial resolution with A-scan rates of ~100 kHz. They either rely on a swept source or use bulky optical spectrometer to spectrally resolve the output light and thus are restricted to the desktop systems with large size. On the other hand, the line scan cameras used to capture the output light intensity can hardly meet the scan rate requirement of the high-resolution 3D real time imaging and thus makes high-speed real-time handheld OCT systems hard to obtain. My research work focuses on the silicon photonics solution to the above difficulty in obtaining a high-speed handheld real time OCT system. Firstly, silicon photonics offer the opportunity for the implementation of integrated optical spectrometers on the high index contrast silicon photonics platform as a replacement of the bulky conventional spectrometer, which is a great step towards portable and handheld OCT system. The use of integrated spectrometer also enables the integration of spectrometers with on-chip germanium photodetectors with ~40 GHz bandwidth to offer higher imaging speed compared with the commercial line scan cameras (line scan rate ~100 kHz).