Highly robust performance of a compact, wide-angle, nano-optic capsule endoscopy camera

Mojtaba Moghaddasi; Bin Hu; Fahimeh Abrinaei; Fahimeh Abrinaei

doi:10.1364/JOSAA.500767

Journal of the Optical Society of America A
Vol. 40,
Issue 12,
pp. 2298-2306
(2023)
•https://doi.org/10.1364/JOSAA.500767

Highly robust performance of a compact, wide-angle, nano-optic capsule endoscopy camera

Mojtaba Moghaddasi, Bin Hu, and Fahimeh Abrinaei

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Mojtaba Moghaddasi, Bin Hu, and Fahimeh Abrinaei, "Highly robust performance of a compact, wide-angle, nano-optic capsule endoscopy camera," J. Opt. Soc. Am. A 40, 2298-2306 (2023)

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Abstract

The performance of capsule endoscopy, which plays an important role in noninvasive medical diagnostics, has been limited by aberrations and large optical sizes caused by several traditional lenses. We propose a capsule endoscopy camera based on a metalens that distinguishes it from existing technologies in three aspects. First, the camera achieved a high FOV of 160°, enabling a comprehensive examination of internal organs. Second, we achieved a compact design with an optical diameter of 1.6 mm and a length of 1.4 mm to enhance patient comfort. The attainment of exceptional image quality with an MTF of more than 45% at 300 lp/mm is the third advantage of this camera. The theoretical performance of this innovative approach shows great potential to improve diagnostic capabilities.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Number of Elements	Wavelength (nm)	F/#	FOV (°)	Working Distance (mm)	Total Length (mm)	Semi-diameter (mm)	Spot Size (µm)	MTF Average (lp/mm)	References
2	532	3.16	160	$> 15$	$< 1.4$	$< 0.8$	$< 4$	$> 0.45$ at 300	Nano-optic capsule endoscopy
4	Visible	4	75	NA	6.88	1.1	15.3	$> 0.3$ at 175	[8]
7	Visible	2	70	Object distance 13	$< 5$	NA	27	$> 0.5$ at 134	[9]
6	Visible	2.8	160	15	$< 5$	$< 1.5$	NA	$> 0.2$ at 180	[10]
9	486–656	3.4	55	NA	11.5	2.75	NA	$> 0.4$ at 167	[14] (front FOV)
7			55–80		10			$> 0.4$ at 167	[14] (side FOV)
5	Visible	2.8–3.5	60–143	NA	11.65	3	NA	$> 0.4$ at 147	[15]
4	415, 540	2.8	109.8	Object distance 10	3.94	2.3	21.3	$> 0.125$ at 285	[17]

Items	Specifications
Aperture diameter (mm)	0.2
FOV (°)	160
Working F-number	3.16
Focal length (mm)	0.626
Working distance (mm)	$> 15$
Semi-diameter (mm)	$< 0.8$
Total track length (mm)	$< 1.4$
Designed MTF (%)	$> 38$ at 300 lp/mm

Items	Specifications
Metalens diameter (mm)	1.6
Nanopillar height (nm)	570
Nanopillar diameter (nm)	60–208
Nanopillar aspect ratio	9.5:1
Period (nm)	260
Substrate thickness (µm)	750
Substrate material	Fused silica
Nanopillar material	${T i O}_{2}$

Number of Elements	Wavelength (nm)	F/#	FOV (°)	Working Distance (mm)	Total Length (mm)	Semi-diameter (mm)	Spot Size (µm)	MTF Average (lp/mm)	References
2	532	3.16	160	$> 15$	$< 1.4$	$< 0.8$	$< 4$	$> 0.45$ at 300	Nano-optic capsule endoscopy
4	Visible	4	75	NA	6.88	1.1	15.3	$> 0.3$ at 175	[8]
7	Visible	2	70	Object distance 13	$< 5$	NA	27	$> 0.5$ at 134	[9]
6	Visible	2.8	160	15	$< 5$	$< 1.5$	NA	$> 0.2$ at 180	[10]
9	486–656	3.4	55	NA	11.5	2.75	NA	$> 0.4$ at 167	[14] (front FOV)
7			55–80		10			$> 0.4$ at 167	[14] (side FOV)
5	Visible	2.8–3.5	60–143	NA	11.65	3	NA	$> 0.4$ at 147	[15]
4	415, 540	2.8	109.8	Object distance 10	3.94	2.3	21.3	$> 0.125$ at 285	[17]

Items	Specifications
Aperture diameter (mm)	0.2
FOV (°)	160
Working F-number	3.16
Focal length (mm)	0.626
Working distance (mm)	$> 15$
Semi-diameter (mm)	$< 0.8$
Total track length (mm)	$< 1.4$
Designed MTF (%)	$> 38$ at 300 lp/mm

Abstract

Data availability

Cited By

Figures (8)

Tables (3)

Equations (4)

Journal of the Optical Society of America A