Photodetectors (PDs) for weak light signal detection have wide applications optical communication and imaging. Antimony sulfide (Sb2S3) as a nontoxic stable light-sensitive material becomes promising candidate PDs, which are developing in the direction of high response, speed, low cost. Herein, self-powered Sb2S3 PD with structure FTO/TiO2/Sb2S3/Au is developed to achieve 300-750 nm visible light. We control thickness about 460 match depletion region width (438 nm) obtain an excellent...

Abstract Lead chalcogenide quantum dots (QDs) are one of the next generations ideal narrow bandgap infrared semiconductors, due to their succinct solution processing, low‐cost fabrication, size‐tunable bandgap, and excellent optoelectronic properties. Tremendous efforts including synthesis methods, surface ligand engineering, device architecture drastically contribute significant improvement performance photodetectors based on QDs. In recent years, with rapid development consumer...

Photodetectors (PDs) are critical parts of visible light communication (VLC) systems for achieving efficient photoelectronic conversion and high-fidelity transmission signals. Antimony sulfide (Sb2S3) as a nontoxic, high optical absorption coefficient, low-cost semiconductor becomes promising candidate applications in VLC systems. Particularly, Sb2S3 PDs were verified to have significantly weak detection ability the region. However, response speed with existing device structures is still...

Abstract Low‐bandgap lead sulfide quantum dots (PbS QDs) can efficiently harness the infrared (IR) light in solar spectrum beyond 1100 nm, showing great application potential bottom subcells of tandem cells. However, achieving further efficiency improvements PbS QDs IR cells still faces many challenges. In this work, effects absorber layer thickness, carrier mobility layer, defect density and at absorber/electron transfer (ETL) interface, doping ETL hole (HTL) on performance (≈0.95 eV) are...

Abstract Antimony sulfide (Sb 2 S 3 ) with high absorption coefficient reveals great potential for photodetectors (PDs) in various fields of military and national economy. A new type depleted Sb thin film photoconductive detector by using titanium dioxide (TiO interlayer the structure Au/(glass/TiO :)Sb /Au is designed. Compared normal Au/Sb devices, PDs obtain a higher switching ratio 90, greatly enhancing responsivity specific detectivity. Owing to electric field depletion region, response...

Tandem solar cells are regarded as an effective way to break through the theoretical efficiency of Shockley–Queisser limit, and large‐size lead sulfide quantum dots (PbS QDs) considered ideal infrared (IR) photovoltaic materials for absorbing low‐energy IR photons in bottom subcells tandem due their tunable bandgaps multiexciton generation effects. However, exposed (100) surface PbS QDs leads poor passivation during ligand‐exchange process, resulting degraded device performance. Herein, a...

Real-time wavefront correction is a challenging problem to present for conventional adaptive optics systems. Here, we an all-optical system realize real-time correction. Using deep learning, the system, which contains only multiple transmissive diffractive layers, trained high-quality imaging unknown, random, distorted wavefronts. Once physically fabricated, this passive optical positioned between lens and image plane all-optically correct new wavefronts whose errors are within training...

Bound states in the continuum (BICs) provide an alternative way of trapping light at nanoscale. Although last 10 years have witnessed tremendous progress on BICs from fundamentals to applications, nonreciprocal and their potential applications not been fully exploited yet. In this study, we demonstrated a one-way quasi-BIC by leveraging all-dielectric magneto-optical (MO) metasurface. We show that key point for achieving is excite magnetization-induced leaky resonance. Here adopt...

The wavefront measuring range and recovery precision of a curvature sensor can be improved by an intensity compensation algorithm. However, in focal system with fast f-number, especially telescope large field view, the accuracy this algorithm cannot meet requirements. A theoretical analysis corrected f-number is first introduced afterwards mathematical equations used are expressed. result then verified through simulation. method such simulation described as follows. First, signal from...

A telescope with a larger primary mirror can collect much more light and resolve objects better than one smaller mirror, so the version is always pursued by astronomers astronomical technicians. Instead of using monolithic large telescopes, which are currently being planned or in construction, have adopted segmented design. Therefore, how to sense phase such key issue for future extremely optical/infrared telescopes. The Dispersed Fringe Sensor non-contact method broadband point sources it...

Large-field telescopes play a significant role in cutting-edge astronomical research fields, such as time-domain astronomy and cosmology. For telescopes, ensuring symmetrical uniform imaging across the entire field-of-view (FoV) is pivotal, particularly for areas photometry astrometry. However, conventional image quality evaluation methods telescope optical systems have mainly focused on spot size. Other alternative methods, ellipticity based also face challenges of high computational...

Polarization and phase devices for terahertz waves have important applications in detection, imaging, communication, etc. Spatially variable metal gratings can be used broad-spectrum, miniaturized, low-cost polarization modulation devices. Based on the effective dielectric constant theory of light propagation multilayer media, we obtain relationship between transmittance extinction ratio parameters such as duty cycle grating, frequency incident wave, angle incidence, thickness refractive...

Abstract The image quality of a large field survey telescope with fast focal ratio the primary mirror is high sensitivity to optical elements’ misalignments and mirror’s deformations. To maintain good performance, perturbations need be aligned, tomographic reconstruction these can derived from wavefront sensing multi-field points for alignment. This work undertakes comprehensive examination related implementation optimization split curvature system, including defocus distance, signal...

Curvature wavefront sensing usually requires the measurement of two defocused images at equal distances before and after focus. In this paper, a new recovery algorithm based on only one image is proposed. This contains following four steps: response matrix calculation, establishment intensity distribution equations, Zernike coefficients solution derived from least squares method, compensation with solved coefficients. The performance in large obscuration ratio fast focal optical system axis...

In adaptive optics (AO) systems, when the paths of beacon source and object separate at an angle θ, a socalled angular anisoplanatism is produced. The anisoplanatic error described by isoplanatic (θ₀) overestimates degradation in AO correction, for it includes piston component which has no effect on optical quality. So, necessary to study effective actual influence performance. Define variance reduction factor (V_rf) as removed, divided anisoplantic...