A5053035791- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Quantum optics and atomic interactions
- Advanced Antenna and Metasurface Technologies
- Plasmonic and Surface Plasmon Research
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Orbital Angular Momentum in Optics
- Optical Coatings and Gratings
- Semiconductor Lasers and Optical Devices
- Diamond and Carbon-based Materials Research
- Photorefractive and Nonlinear Optics
- Antenna Design and Analysis
- Semiconductor Quantum Structures and Devices
- Optical Wireless Communication Technologies
- Advanced Optical Imaging Technologies
- Atomic and Subatomic Physics Research
- Random lasers and scattering media
- Advanced Photonic Communication Systems
- Neural Networks and Reservoir Computing
- Advanced Materials and Mechanics
- Force Microscopy Techniques and Applications
- Optical Network Technologies
California Institute of Technology
2016-2025
Kavli Energy NanoScience Institute
2019-2025
IBM (United States)
2024
Samsung (United States)
2017
University of San Francisco
2016
Hewlett-Packard (United States)
2010-2013
Stanford University
2006-2012
University of California, Santa Barbara
2008
Flat optical devices thinner than a wavelength promise to replace conventional free-space components for wavefront and polarization control. Transmissive flat lenses are particularly interesting applications in imaging on-chip optoelectronic integration. Several designs based on plasmonic metasurfaces, high-contrast transmitarrays gratings have been recently implemented but not provided performance comparable curved lenses. Here we report polarization-insensitive, micron-thick, transmitarray...
Varifocal lenses, conventionally implemented by changing the axial distance between multiple optical elements, have a wide range of applications in imaging and beam scanning. The use conventional bulky refractive elements makes these varifocal lenses large, slow, limits their tunability. Metasurfaces, new category lithographically defined diffractive devices, enable thin lightweight with precisely engineered phase profiles. Here, we demonstrate tunable metasurface doublets, based on...
Abstract Optical metasurfaces are two-dimensional arrays of nano-scatterers that modify optical wavefronts at subwavelength spatial resolution. They poised to revolutionize optics by enabling complex low-cost systems where multiple lithographically stacked and integrated with electronics. For imaging applications, metasurface stacks can perform sophisticated image corrections be directly sensors. Here we demonstrate this concept a miniature flat camera integrating monolithic lens doublet...
Optical nonlinearities enable photon-photon interaction and lie at the heart of several proposals for quantum information processing, nondemolition measurements photons, optical signal processing. To date, largest have been realized with single atoms atomic ensembles. We show that a dot coupled to photonic crystal nanocavity can facilitate controlled phase amplitude modulation between two modes light single-photon level. At larger control powers, we observed shifts up pi/4 50%. This was...
Metasurfaces are nano-structured devices composed of arrays subwavelength scatterers (or meta-atoms) that manipulate the wavefront, polarization, or intensity light. Like other diffractive optical devices, metasurfaces suffer from significant chromatic aberrations limit their bandwidth. Here, we present a method for designing multiwavelength using unit cells with multiple meta-atoms, meta-molecules. Transmissive lenses efficiencies as high 72% and numerical apertures 0.46 simultaneously...
The zero-phonon transition rate of a nitrogen-vacancy center is enhanced by factor ∼70 coupling to photonic crystal resonator fabricated in monocrystalline diamond using standard semiconductor fabrication techniques. Photon correlation measurements on the spectrally filtered line show antibunching, signature that collected photoluminescence emitted primarily single center. linewidth coupled and spectral diffusion are characterized high-resolution excitation spectroscopy.
Abstract Dielectric metasurfaces are two‐dimensional structures composed of nano‐scatterers that manipulate the phase and polarization optical waves with subwavelength spatial resolution, thus enabling ultra‐thin components for free‐space optics. While high performance devices various functionalities, including some difficult to achieve using conventional setups have been shown, most demonstrated fixed parameters. Here, we demonstrate highly tunable dielectric metasurface based on thick...
Polarization is a degree of freedom light carrying important information that usually absent in intensity and spectral content. Imaging polarimetry the process determining polarization state light, either partially or fully, over an extended scene. It has found several applications various fields, from remote sensing to biology. Among different devices for imaging polarimetry, division focal plane cameras (DoFP-PCs) are more compact, less complicated, expensive. In general, DoFP-PCs based on...
Diffraction gratings disperse light in a rainbow of colors with the opposite order than refractive prisms, phenomenon known as negative dispersion. While dispersion can be controlled via material index, diffractive is fundamentally an interference effect dictated by geometry. Here we show that this fundamental property altered using dielectric metasurfaces, and experimentally demonstrate focusing mirrors positive, zero, hyper These optical elements are implemented reflective metasurface...
A rare-earth quantum memory The development of global networks will require chip-scale optically addressable memories for state storage, manipulation, and swapping. Zhong et al. fabricated a nanostructured photonic crystal cavity in rare-earth-doped material to form high-fidelity (see the Perspective by Waks Goldschmidt). enhanced light-matter interaction, allowing states be stored retrieved from on demand. high fidelity small footprint device offer powerful building block information...
Abstract Physical geometry and optical properties of objects are correlated: cylinders focus light to a line, spheres point arbitrarily shaped introduce aberrations. Multi-functional components with decoupled geometrical form function needed when specific functionalities must be provided while the shapes dictated by other considerations like ergonomics, aerodynamics or aesthetics. Here we demonstrate an approach for decoupling from their physical shape using thin flexible dielectric...
The angular response of thin diffractive optical elements is highly correlated. For example, the angles incidence and diffraction a grating are locked through momentum determined by period. Other devices, including conventional metasurfaces, have similar behavior due to fixed locations Fresnel zone boundaries weak sensitivity meta-atoms. To alter this fundamental property, we introduce angle-multiplexed composed reflective high-contrast dielectric U-shaped meta-atoms, whose under...
Abstract To increase system capacity of underwater optical communications, we employ the spatial domain to simultaneously transmit multiple orthogonal beams, each carrying an independent data channel. In this paper, show up a 40-Gbit/s link by multiplexing and transmitting four green orbital angular momentum (OAM) beams through single aperture. Moreover, investigate degrading effects scattering/turbidity, water current, thermal gradient-induced turbulence, find that gradients cause most...
Abstract Metasurfaces are two-dimensional arrangements of optical scatterers rationally arranged to control wavefronts. Despite the significant advances made in wavefront engineering through metasurfaces, most these devices designed for and operate at a single wavelength. Here we show that spatial multiplexing schemes can be applied increase number operation wavelengths. We use high contrast dielectric transmittarray platform with amorphous silicon nano-posts demonstrate polarization...