Phase imaging Endoscopy using metalens chromatic aberration.

Aamod Shanker; Arka Majumdar; Johannes Froech

doi:10.1117/12.2650842

17 March 2023 Phase imaging Endoscopy using metalens chromatic aberration.

Aamod Shanker, Arka Majumdar, Johannes Froech

Proceedings Volume PC12356, Endoscopic Microscopy XVIII; PC123560C (2023) https://doi.org/10.1117/12.2650842
Event: SPIE BiOS, 2023, San Francisco, California, United States

Abstract

Endoscopic imaging enables label free microscopy on the surface of organs, yet relies on spectral absorption information for contrast. The image in a scanning free system is formed using a tiny metalens, or graded index at the tip of the endoscope fiber bundle. However chromatic aberrations often lead to images being distorted between the color channels. In this paper we propose a phase imaging method that utilizes different color channels to encode different depth planes using the chromatic aberrations inherent in small metaoptics or grin leness. The metalens that make the image on the coherent fiber bundle has size dependent chromatic aberration that shifts the focal plane for different wavelengths. We present a phase imaging method that utilizes the chromatic defocusing in endoscope to compute the shape of transparent surfaces at video rate (for transparent lesion detection where the absorption changes are slight or minimal). The phase is solved in a single shot using RGB data.

Conference Presentation

Citation Download Citation

Aamod Shanker, Arka Majumdar, and Johannes Froech "Phase imaging Endoscopy using metalens chromatic aberration.", Proc. SPIE PC12356, Endoscopic Microscopy XVIII, PC123560C (17 March 2023); https://doi.org/10.1117/12.2650842

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