Integral imaging is a promising three-dimensional (3D) technique that captures and reconstructs light field information. Microlens arrays are usually used for the reconstruction process to display 3D scenes viewer. However, inherent chromatic aberration of microlens array reduces viewing quality, thus, broadband achromatic remains challenge integral imaging. Here, we realize silicon nitride metalens in visible region can be reconstruct optical white light. The contains 60 ×...

Subwavelength imaging requires the use of high numerical aperture (NA) lenses together with immersion liquids in order to achieve highest possible resolution. Following exciting recent developments metasurfaces that have achieved efficient focusing and novel beam-shaping, race is on demonstrate ultrahigh-NA metalenses. The NA has been demonstrated so far = 1.1, a TiO2 metalens back-immersion. Here, we introduce transmission visible range, based crystalline silicon (c-Si). higher refractive...

Dielectric metasurfaces require high refractive index contrast materials for optimum performance. This requirement imposes a severe restraint; either devices have been demonstrated at wavelengths of 700 nm and above using high-index semiconductors such as silicon, or they use lower dielectric TiO2 Si3N4 operate in the visible wavelength regime. Here, we show that silicon can be exploited short 532 by demonstrating crystalline metasurface with transmission efficiency 71% this diffraction 95%...

Surfaces enabling directional drop self-transport have exceptional applications in digital microfluidics, chemical analysis, bioassay, and microreactor technology. While such properties been obtained by engineering a surface with anisotropic microstructures, microscopic liquid residue-though it might be invisible macroscopically-is generally left behind the transported drop, resulting undesired transport loss severely limiting practical of surface. Here, origin residue is studied...

Optical responses of twisted bilayer graphene at targeted wavelengths can be amplified by leveraging energy levels van Hove singularities (VHS) via tuning periods moiré superlattices. Therefore, precise control twist angles as well the superlattices is necessary for fabricating integrated optoelectronic devices such photodetectors and emitters. Although recent advances in angle help observation correlated states magic-angle structures, impact on enhanced optical absorption still under...

We design and fabricate a low-loss silicon photonic two-dimensional grating coupler that serves to couple light between standard single-mode fibers waveguides in the silicon-on-insulator platform split both orthogonal polarization states. The efficiency of fabricated device is enhanced by backside metal mirror reaches record value -1.8 dB with 1 bandwidth 32 nm around 1550 nm. demonstrated coupling 2.2 better than conventional without mirror.

Optical modulators have been and will continue to be essential devices for energy- cost-efficient optical communication networks. Heterogeneous silicon lithium niobate demonstrated promising performances of low loss, drive voltage, large modulation bandwidth. However, DC bias drift is a major drawback using as the active electro-optic material. Here, we demonstrate high-speed bias-drift-free Mach–Zehnder based on heterogeneous platform. The combine stable thermo-optic biases in ultra-fast...

With the distinct advantages of high resolution, small pixel size, and multi-level pure phase modulation, liquid crystal on silicon (LCoS) devices afford precise reconfigurable spatial light modulation that enables versatile applications ranging from micro-displays to optical communications. However, LCoS suffer a long-standing problem polarization-dependent response in they only perform one linear polarization light, polarization-independent modulation-essential for most applications-have...

High-quality SiNx films with controllable low stress and optical loss are deposited at ultra-low temperature (75 °C) using inductively coupled plasma chemical vapor deposition (ICP-CVD). Two kinds of integrated photonic structures have been demonstrated that exemplify its viability as a integration platform. A microcavity consists two distributed Bragg reflectors (DBR) formed by alternating total 49 layers SiO2 thickness about 11.5 μm is grown without any cracks, confirming the excellent...

We demonstrate hybrid amorphous silicon uniform grating couplers for efficient coupling between the standard single-mode fiber and sub-micron lithium niobate waveguides. The exhibit efficiency of -3.06 dB 1-dB bandwidth 55 nm. can also provide a universal building block applicable to other photonic platforms such as nitride waveguides, whose moderate refractive index values prevent high be fabricated in native waveguide.

Electrically pumped lasers directly grown on silicon are key devices interfacing microelectronics and photonics.We report here, for the first time, to best of our knowledge, an electrically pumped, room-temperature, continuous-wave (CW) single-mode distributed feedback laser array fabricated in InAs/GaAs quantum-dot gain material epitaxially silicon.CW threshold currents as low 12 mA side mode suppression ratios high 50 dB have been achieved from individual array.The array, compatible with...

We demonstrate highly efficient lithium niobate thin film Michelson interferometer modulators with half-wave voltage length product of 1.4 V∙cm. Amorphous silicon grating couplers have been incorporated to achieve a 3.8-dB/port waveguide-fiber coupling loss. Devices 1-mm phase shifter arms footprint 2.5 mm × 1.7 mm. The demonstrated modulation data rates is up 35 Gb/s.

In silicon photonics, the cavity mode is a fundamental mechanism to design integrated passive devices for on-chip optical information processing. Recently, corner state in second-order topological photonic crystal (PC) rendered global method achieve an intrinsic mode. It crucial explore such circuits (PICs) under in-plane excitation. Here, we study both theoretically and experimentally nanophotonic silicon-on-insulator PC at telecommunications wavelength. theory, expectation values of...

Abstract The missing piece in the jigsaw of silicon photonics is a light source that can be easily incorporated into standard fabrication process. Here, laser‐like emission reported employs few‐layer semiconducting transition metal dichalogenides molybdenum ditelluride (MoTe 2 ) as gain material photonic crystal L3 nanocavity. An optically pumped MoTe ‐on‐silicon at 1305 nm, i.e. center “O‐band” optical communications, demonstrated room temperature and with threshold power density 1.5 kW/cm...

In this work, we proposed and experimentally demonstrated a compact low polarization-dependent silicon waveguide crossing based on subwavelength grating multimode interference couplers. The structure decreases the effective refractive index difference shrinks device footprint. Our designed is fabricated 220-nm SOI platform performs well. measured characterized with insertion loss (< 1 dB), polarization-dependence 0.6 crosstalk -35 dB) for both TE TM polarizations footprint of 12.5 μm × μm.

Optical modulators were, are, and will continue to be the underpinning devices for optical transceivers at all levels of networks. Recently, heterogeneously integrated silicon lithium niobate (Si/LN) have demonstrated attractive overall performance in terms loss, drive voltage, modulation bandwidth. However, due moderate Pockels coefficient niobate, device length Si/LN modulator is still relatively long low-drive-voltage operation. Here, we report a folded Mach–Zehnder consisting meandering...

As optical resonances with high-quality (Q) factors, bound states in the continuum (BICs) supported a metamaterial low loss have attracted great interest due to their potential applications photonic devices different functionalities. However, most studies focus on influence of symmetry breaking constituent elements Q factors quasi-BICs, and less attention is paid coupling between elements. Here, we investigate numerically experimentally quasi-BICs revealed metasurfaces composed regularly...

The chip-fiber grating coupler is a fundamental building block in integrated photonics, providing convenient on-wafer testing and packaging. Couplers based on silicon nitride (SiNx) material platform can achieve wider bandwidths than silicon-based couplers, but suffer from lower efficiency due to the relative low refractive index. of SiNx be improved by using high-reflectivity reflectors underneath. However, such reflector requires several fabrication steps, including lithography, etching,...

Hybrid Silicon and Lithium Niobate photonic integration platform has emerged as a promising candidate to combine the scalability of silicon with high modulation performance Niobate. Here, we report hybrid Mach-Zehnder modulator integrated thermal-optical bias controller an on-chip RF terminator. The device demonstrates electro-optical bandwidth up 60 GHz, low half-wave voltage 2.25 V, optical loss 2 dB, DC biasing 1.93 V (or power 23.77 mW), reliable stable characteristics. On-off keying 100...

Silicon (Si)-based light emitters compatible with the current fabrication technology of Si chips are crucial for realizing all-optical computation. Here, we propose a Si/Au hybrid nanostructure composed regular array nanopillars and thin gold (Au) film. An accidental bound state in continuum (BIC) originating from interference mirror-image-induced magnetic dipole surface plasmon polariton can be achieved by deliberately designing structure parameters. Efficient nonlinear optical emission is...

Photonic integrated devices that emit vortex beam carrying orbital angular momentum are becoming key components for multiple applications. Here we propose and demonstrate a high-efficiency emitter based on silicon micro-ring resonator with metal mirror. Such compact is capable of generating beams high efficiency small divergence angle. Vector various topological charges selectively generated by the at different wavelengths an emission up to 37%.