Toward optical coherence tomography on a chip: in vivo threedimensional human retinal imaging using photonic integrated circuitbased arrayed waveguide gratings

• 作者: Elisabet A.Rank Ryan Sentosa Danielle J.Harper Matthias Salas Anna Gaugutz Dana Seyringer Stefan Nevlacsil Alejandro Maese-Novo Moritz Eggeling Paul Muellner Rainer Hainberger Martin Sagmeister Jochen Kraft Rainer A.Leitgeb Wolfgang Drexler
• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Articles
• 页码范围: 71-85
• 页数: 15页
• 语种: 英文

摘要

In this work, we present a significant step toward in vivo ophthalmic optical coherence tomography and angiography on a photonic integrated chip. The diffraction gratings used in spectral-domain optical coherence tomography can be replaced by photonic integrated circuits comprising an arrayed waveguide grating. Two arrayed waveguide grating designs with 256 channels were tested, which enabled the first chip-based optical coherence tomography and angiography in vivo three-dimensional human retinal measurements. Design 1 supports a bandwidth of 22 nm, with which a sensitivity of up to 91 dB (830μW) and an axial resolution of 10.7μm was measured. Design 2 supports a bandwidth of 48 nm, with which a sensitivity of 90 dB (480μW) and an axial resolution of 6.5μm was measured. The silicon nitride-based integrated optical waveguides were fabricated with a fully CMOS-compatible process, which allows their monolithic co-integration on top of an optoelectronic silicon chip. As a benchmark for chip-based optical coherence tomography, tomograms generated by a commercially available clinical spectral-domain optical coherence tomography system were compared to those acquired with on-chip gratings. The similarities in the tomograms demonstrate the significant clinical potential for further integration of optical coherence tomography on a chip system.