A5030452789- Photonic and Optical Devices
- Photonic Crystals and Applications
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Semiconductor Lasers and Optical Devices
- Optical Coatings and Gratings
- Optical Network Technologies
- Photorefractive and Nonlinear Optics
- Advanced Photonic Communication Systems
- Metamaterials and Metasurfaces Applications
- Advanced Fiber Optic Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Mechanical and Optical Resonators
- Neural Networks and Reservoir Computing
- Laser-Matter Interactions and Applications
- Near-Field Optical Microscopy
- Advanced Fluorescence Microscopy Techniques
- Nanowire Synthesis and Applications
- Photoacoustic and Ultrasonic Imaging
- Advanced Antenna and Metasurface Technologies
- Advanced Optical Imaging Technologies
- Electrowetting and Microfluidic Technologies
- Semiconductor Quantum Structures and Devices
- Advanced biosensing and bioanalysis techniques
- Orbital Angular Momentum in Optics
University of California, San Diego
2016-2025
University of California System
2006-2025
Centre de Nanosciences et de Nanotechnologies
2020
Université Paris-Saclay
2020
Centre National de la Recherche Scientifique
2020
University of California, Berkeley
1989-2019
Jacobs (United States)
2005-2015
The University of Sydney
2013
UC San Diego Health System
2012
University of California, Los Angeles
2002-2012
The basic building block of ever larger data centers has shifted from a rack to modular container with hundreds or even thousands servers. Delivering scalable bandwidth among such containers is challenge. A number recent efforts promise full bisection between all servers, though significant cost, complexity, and power consumption. We present Helios, hybrid electrical/optical switch architecture that can deliver reductions in the switching elements, cabling, consumption relative recently...
Topological lasing Resonant cavities that confine light are crucial components of lasers. Typically, these designed to high specification get the best possible output. That, however, can limit their integration into photonic devices and optical circuits. Bahari et al. fabricated resonant arbitrary shape within a hybrid crystal structure. The confinement topologically protected edge states resulted in at communication wavelengths. Relaxing cavity design criteria should be useful designing...
Optical communications and computing require on-chip nonreciprocal light propagation to isolate stabilize different chip-scale optical components. We have designed fabricated a metallic-silicon waveguide system in which the potential is modulated along length of such that obtained on silicon photonic chip. Nonreciprocal transport one-way mode conversion are demonstrated at wavelength 1.55 micrometers both simulations experiments. Our compatible with conventional complementary...
The interplay of light and magnetism has been a topic interest since the original observations Faraday Kerr where magnetic materials affect polarization. While these effects have historically exploited to use as probe there is increasing research on using polarized alter or manipulate magnetism. For instance deterministic switching without any applied fields laser pulses circular observed for specific ferrimagnetic materials. Here we demonstrate, first time, optical control ferromagnetic...
We introduce and present experimental evaluations of loss nonlinear optical response in a waveguide an resonator, both implemented with silicon nitride/ dioxide material platform prepared by plasma-enhanced chemical vapor deposition dual frequency reactors that significantly reduce the stress consequent devices. measure relatively small approximately 4dB/cm waveguides. The fabricated ring resonators add-drop all-pass arrangements demonstrate quality factors Q=12,900 35,600. are used to...
The basic building block of ever larger data centers has shifted from a rack to modular container with hundreds or even thousands servers. Delivering scalable bandwidth among such containers is challenge. A number recent efforts promise full bisection between all servers, though significant cost, complexity, and power consumption. We present Helios, hybrid electrical/optical switch architecture that can deliver reductions in the switching elements, cabling, consumption relative recently...
Recent proposals have employed optical circuit switching (OCS) to reduce the cost of data center networks. However, relatively slow times (10--100 ms) assumed by these approaches, and accompanying latencies their control planes, has limited its use only largest networks with highly aggregated constrained workloads. As faster switch technologies become available, designing a plane capable supporting them becomes key challenge.
Identification of the cellular players and molecular messengers that communicate neuronal activity to vasculature driving cerebral hemodynamics is important for (1) basic understanding cerebrovascular regulation (2) interpretation functional Magnetic Resonance Imaging (fMRI) signals. Using a combination optogenetic stimulation 2-photon imaging in mice, we demonstrate selective activation cortical excitation inhibition elicits distinct vascular responses identify vasoconstrictive mechanism as...
The propagation of surface plasmon polaritons on metallic waveguides adjacent to a gain medium is considered. It shown that the presence can compensate for absorption losses in metal. conditions existence polariton and its lossless wavefront behavior are derived analytically single infinite metal-gain boundary. In addition, cases thin slab stripe geometries also investigated using finite element simulations. effect layer distance from SPP waveguide investigated. calculated requirements...
A high spectral resolution, 2D nanohole-array-based surface plasmon resonance sensor that operates at normal or near incidence--facilitating spatial resolution imaging--is presented. The angular and transmittance of the structure is modified from a Fano type to pure Lorentzian line shape with parallel orthogonal polarizer-analyzer pair. This change leads linewidth narrowing maximizes which we show be O(10−5) refractive index units (RIU). We estimate potential this system O(10−6) RIU under...
An analytical expression of spectral sensitivity derived from a surface plasmon polariton dispersion relation for two-dimensional nanohole array resonance sensor is presented. The the depends on periodicity and order excited modes. further confirmed by rigorous electromagnetic simulation validated experimental results. Real-time monitoring protein-protein specific bonding performed to demonstrate integrated microfluidic biosensor.
Coherent image amplification by two-wave coupling in a crystal of photorefractive BaTiO3 is analyzed. This amplifier optimized with respect to such operational characteristics as gain versus amplified quality and space-bandwidth product. Experimental results that demon-strate coherent 4000, product 106, gray-level dynamic range greater than 100 are presented.
The group velocity dispersion (GVD) of silicon nitride waveguides, prepared using plasma enhanced chemical vapor deposition, is studied and characterized experimentally in support nonlinear optics applications. We show that the may be engineered by varying geometry waveguide demonstrate measured anomalous GVD values as high −0.57 ps2/m normal 0.86 ps2/m. also absence any observed loss at telecommunications wavelength peak intensities up to 12 GW/cm2. Spectral broadening due self phase...
Optofluidics integrates the fields of photonics and microfluidics, providing new freedom to both permitting realization optical fluidic property manipulations at chip scale. was formed only after many breakthroughs in as understanding fluid behaviour micron level enabled researchers combine advantages optics fluids. This review describes progress optofluidics from a perspective, highlighting various optofluidic aspects ranging device's manipulation an interactive integration between First,...
Metasurfaces consisting of ultrathin nanostructures are utilized to control the properties light including its phase, amplitude and polarization. Hereby, we demonstrate capability such structures perform arbitrary polarization selective beam shaping using dielectric nanoscale metasurfaces implemented in silicon. By illuminating structure with right handed circular reconstruct a desired image. When switching into orthogonal state, obtain reconstruction different This demonstration shows...
Abstract We present an ultra-compact single-shot spectrometer on silicon platform for sparse spectrum reconstruction. It consists of 32 stratified waveguide filters (SWFs) with diverse transmission spectra sampling the unknown input signal and a specially designed structure splitting incident into those low power imbalance. Each SWF has footprint less than 1 µm × 30 µm, while splitter in total occupy area about 35 260 which to best our knowledge, is smallest realized photonic platform....
Neuromorphic computing approaches become increasingly important as we address future needs for efficiently processing massive amounts of data. The unique attributes quantum materials can help these by enabling new energy-efficient device concepts that implement neuromorphic ideas at the hardware level. In particular, strong correlations give rise to highly non-linear responses, such conductive phase transitions be harnessed short and long-term plasticity. Similarly, magnetization dynamics...
We investigate an incremental recording technique for multiplexed hologram storage in photorefractive crystals, which each is recorded with multiple short exposures. The performance theoretically compared that of scheduled (single exposure per hologram) recording. Our analysis shows this systematically controls the signal uniformity and can also decrease total time. present experimental demonstration LiNbO3 using a binary orthogonal phase-code addressing technique.
We introduce a low refractive index layer between the metal and gain medium in metal-coated laser resonators demonstrate that it can significantly reduce dissipation losses. Analysis of waveguide shows for given radius, has an optimal thickness which lasing threshold is minimal. The analysis used design novel three-dimensional cylindrical resonator smaller than vacuum wavelength all three dimensions exhibits enough to lase at room temperature.