Advanced Photonics, Journal Year: 2024, Volume and Issue: 6(05)
Published: Oct. 31, 2024
Language: Английский
Communications Engineering, Journal Year: 2025, Volume and Issue: 4(1)
Published: March 19, 2025
Abstract Metalenses, with their ultrathin thicknesses and ease for achieving ultra small diameters, offer a promising alternative to refractive lenses in miniaturized imaging systems, such as endoscopes, potentially enabling applications tightly confined spaces. However, traditional metalenses suffer from strong chromatic aberrations, limiting utility multi-color imaging. To address this limitation, here we present an inverse-designed polychromatic metalens diameter of 680 μm, focal length 400 low dispersion across 3 distinct wavelengths at 643 nm, 532 444 nm. The collimates steers light emitted scanning fiber tip, generating beams 70° field-of-view provide illumination scan-based provides close-to-diffraction-limited 0.5° angular resolution, only restricted by the effective aperture system. average relative efficiency among three design is around 32% on-axis angle 13% averaged entire field-of-view. This work holds promise application endoscopes other systems.
Language: Английский
Citations
0
Nanophotonics, Journal Year: 2024, Volume and Issue: 13(22), P. 4101 - 4110
Published: Aug. 28, 2024
Abstract Due to signal shielding caused by building structures, conventional mature positioning technologies such as the Global Positioning System (GPS) are only suitable for outdoor navigation and detection. However, there many scenarios that urgently require high-precision indoor technologies, wireless optical communications (OWCs), in large buildings, warehouse management. Here, we proposed a millimeter-precision technology based on metalens-integrated camera, which determines position of device through imaging beacon LEDs. Thanks wide-angle design our metalens, camera can accurately capture images LEDs even when it is situated distant corner locations. Consequently, localization scheme achieves millimeter-level accuracy across majority (∼120°) area. Compared traditional schemes photodiode (PD), imaging-based approach demonstrates superior resistance interference, thereby safeguarding precision from external signals influence. Furthermore, compact dimensions high performances make integration into highly portable devices, smartphones drones, revealing its broad potential applications future.
Language: Английский
Citations
3
Nanophotonics, Journal Year: 2024, Volume and Issue: 13(24), P. 4417 - 4428
Published: Oct. 16, 2024
This study presents the design, fabrication, and characterization of a wide field-of-view (FOV) metalens optimized for capsule endoscopy. The achieved 165° FOV with high modulation transfer function (MTF) 300 lines per millimeter (lp/mm) across entire FOV, operating in near-infrared (NIR) narrow-bandpass imaging at 940 nm. performance metalens-based system is evaluated using two bandwidths, 12 nm 32 nm, showing MTF values 0.2 0.3 250 lp/mm, respectively. maintains compact form factor total track length 1.4 mm diameter 1.58 mm. Compared to traditional 108° endoscope, nano-optic endoscope demonstrated superior terms contrast, resolution. advancement represents significant step toward enhancing diagnostic capabilities medical imaging, offering improved more package compared conventional optics.
Language: Английский
Citations
1
Optics Letters, Journal Year: 2024, Volume and Issue: 49(17), P. 4851 - 4851
Published: Aug. 6, 2024
Computational imaging using a Pancake lens can help reduce the size of optical systems by folded optics. However, cameras frequently exhibit inferior image quality due to stray light, low light transmission, and spatially varying aberrations. In this Letter, we propose thin lightweight camera comprising polarization-based catadioptric Fourier Position encoding Network (FPNet). The achieves high-quality at an f-number 0.4 expansive 88° field view. FPNet encodes positional order point spread functions, mitigating global degradation improving 10.13 dB in PSNR. have potential applications mobile photography virtual/augmented reality.
Language: Английский
Citations
0
Advanced Photonics, Journal Year: 2024, Volume and Issue: 6(05)
Published: Oct. 31, 2024
Language: Английский
Citations
0