Optical analog signal processing has been gaining significant attention as a way to overcome the speed and energy limitations of digital techniques. Metasurfaces offer promising avenue towards this goal due their efficient manipulation optical signals over deeply subwavelength volumes. To date, metasurfaces have proposed transform in spatial domain, e.g., for beam steering, focusing, or holography, which angular-dependent responses, nonlocality, are unwanted features that must be avoided...

Image processing and edge detection are at the core of several newly emerging technologies, such as augmented reality, autonomous driving more generally object recognition. is typically performed digitally using integrated electronic circuits algorithms, implying fundamental size speed limitations, well significant power needs. On other hand, it can also be in a low-power analog fashion Fourier optics, requiring however bulky optical components. Here, we introduce dielectric metasurfaces...

Optical analog computing using metasurfaces has been the subject of numerous studies, aimed at implementing highly efficient and ultrafast image processing in a compact device. The proposed approaches to date have shown limitations terms spatial resolution, overall efficiency, polarization azimuthal angular dependence. Here, we present design polarization-insensitive metasurface with tailored nonlocality based on Fano resonant response, enabling both odd- even-order mathematical operations...

Abstract In this work, we present the fabrication and analysis of a wafer‐bonded GaInP/GaInAsP//Si triple‐junction solar cell with 36.1% conversion efficiency under AM1.5g spectral illumination. The new design presents an improvement over previous III‐V//Si cells by implementation rear‐heterojunction for middle cell. Furthermore, advanced metallodielectric rear‐side grating was used light trapping enhancement in silicon bottom that increased subcell current 1.4 mA/cm 2 . external radiative...

The recent emergence of thin-film lithium niobate (TFLN) has extended the landscape integrated photonics. This been enabled by commercialization TFLN wafers and advanced nanofabrication such as high-quality dry etching. However, fabrication imperfections still limit propagation loss to a few dB/m, restricting impact this platform. Here, we demonstrate microresonators with record-high intrinsic quality ( Q ) factor twenty-nine million, corresponding an ultra-low 1.3 dB/m. We present spectral...

Minimizing reflection losses is required for the efficient operation of a wide range optical components. Antireflection coatings supporting Fabry-Pérot resonances are commonly used to solve this problem and can be applied on an industrial scale. Recent work has shown that reflections also reduced by placing array high-index nanostructures surface. In such coatings, antireflection achieved tailoring scattering Mie resonances. Here, we design fabricate Si metasurfaces combine both in single...

The energy efficiency of optoelectronic components and devices is critically dependent on minimizing undesired reflections from interfaces between materials with differing optical properties. Antireflection coatings based metamaterials deep-subwavelength features offer superior performance over their homogeneous counterparts as they afford subtle tuning the refractive index gradients therein. Recent work also showed that arrays larger-sized (250 nm diameter), high-index nanostructures placed...

We designed semitransparent metagrating supercells that enable control over the spectrum and directivity of incident light for applications in photovoltaics with tailored angular appearance. The building block is a 100–120 nm wide 175 tall silicon nanowire shows strong Mie resonance around λ = 650 nm. By arranging resonant scatterers into metagratings increasing pitch (675–1300 nm), we created Lambertian-like scattering distribution an range choice. millimeter-sized metasurfaces were...

Lead-halide perovskites offer excellent properties for lighting and display applications. Nanopatterning perovskite films could enable perovskite-based devices with designer properties, increasing their performance adding novel functionalities. We demonstrate the potential of nanopatterning achieving light emission a film into specific angular range by introducing periodic sol-gel structures between injection emissive layer using substrate conformal imprint lithography (SCIL). Structural...

Multijunction solar cells provide a path to overcome the efficiency limits of standard silicon by harvesting broader range spectrum more efficiently. However, Si-based multijunction architectures are hindered incomplete in near-infrared (near-IR) spectral as Si subcells have weak absorption close band gap. Here, we introduce an integrated near-field/far-field light trapping scheme enhance silicon-based near-IR range. To achieve this, design nanopatterned diffractive silver back-reflector...

We design an optically resonant bulk heterojunction solar cell to study optoelectronic properties of nanostructured p-n junctions. The nanostructures yield strong light-matter interaction as well distinct charge-carrier extraction behavior, which together improve the overall power conversion efficiency. demonstrate high-resolution substrate conformal soft-imprint lithography technology in combination with state-of-the art ZnO nanoparticles create a nanohole template electron transport layer....

A scalable selective-area electrochemical method is reported for the fabrication of interconnected metal nanostructures. In this work, silver nanowire grids application transparent electrodes explored. The presented based on a through-the-mask electrodeposition method, where mask made by using substrate conformal imprint lithography. We find that nucleation density nanoparticles key parameter successful homogeneous void-free filling template. independently controlled nuclei and their growth...

Crystalline Si solar cells based on thin wafers, with thicknesses in the range of 5–50 μm, can find applications a wide markets where flexibility and bendability are important. For these cells, avoiding standard macroscopic texture is desirable to increase structural integrity. Herein, nanopatterned SiN x antireflection (AR) coating that consists 174 nm‐radius 118 nm‐high nanodisks arranged square lattice (59 nm) layer introduced. This geometry combines Fabry–Pérot AR forward scattering by...

Nonreciprocal devices - in which light is transmitted with different efficiencies along opposite directions are key technologies for modern photonic applications, yet their compact and miniaturized implementation remains an open challenge. Among avenues, nonlinearity-induced nonreciprocity has attracted significant attention due to the absence of external bias integrability within conventional material platforms. So far, been demonstrated only guided platforms using high-Q resonators. Here,...

The optical properties of periodic metallic nanoparticle lattices have found many exciting applications. Indium is an emerging plasmonic material that offers to extend the applications given by gold and silver from visible ultraviolet spectral range, with in imaging, sensing, lasing. Due high vapor pressure/low melting temperature indium, nanofabrication ordered nanoparticles nontrivial. In this work, we show potential selective area electrochemical deposition generate large-area pillars for...

Integrated near-field/far-field light scattering design creates 36,1% efficient Si/III-V multijunction solar cellAndrea Cordaro a, Ralph Muller b, Stefan Tabernig Nico Tucher Patrick Schygulla Oliver Hohn Benedikt Blasi Albert Polman aa Center for Nanophotonics, AMOLF, Science Park, 104, Amsterdam, Netherlandsb Fraunhofer Institute Solar Energy Systems ISE, Germany.International Conference on Hybrid and Organic PhotovoltaicsProceedings of International Photovoltaics (HOPV24)València, Spain,...

Inverse designed metasurfaces can solve prescribed Fredholm integral equations at optical wavelengths. To this end, a mirror is included to provide the feedback required perform Neumann series that solves equation.

We present a metasurface-based platform that solves Fredholm integral equations of the second kind for free-space radiation. An inverse-designed metagrating is coupled to semitransparent mirror providing feedback in order perform an analog version Neumann series.

The world's ever-growing need for efficient computing has been driving researchers from diverse research fields to explore alternatives the current digital paradigm. In this context, field of all-optical analog processing is gaining significant attention opening new possibilities overcome bottlenecks standard microelectronics [1–5]. We present a Si-based optical metastructure that solves Fredholm integral equations second kind in fully fashion at frequencies. exploit analogy between equation...