A5057307996- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Advanced Fiber Laser Technologies
- Advanced Antenna and Metasurface Technologies
- Terahertz technology and applications
- Photonic Crystals and Applications
- Superconducting and THz Device Technology
- Near-Field Optical Microscopy
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Nonlinear Photonic Systems
- Thermal Radiation and Cooling Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Antenna Design and Analysis
- Optical Coatings and Gratings
- Laser-Matter Interactions and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Nonlinear Optical Materials Studies
- Additive Manufacturing and 3D Printing Technologies
- Semiconductor Quantum Structures and Devices
- Energy Harvesting in Wireless Networks
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Advanced Fluorescence Microscopy Techniques
Sandia National Laboratories
2020-2024
Center for Integrated Nanotechnologies
2020-2024
META Health
2024
Imperial College London
2014-2020
Nanosystems Initiative Munich
2019
Ludwig-Maximilians-Universität München
2019
Quantum state engineering, the cornerstone of quantum photonic technologies, mainly relies on spontaneous parametric down-conversion and four-wave mixing, where one or two pump photons decay into a photon pair. Both these nonlinear effects require momentum conservation (i.e., phase-matching) for participating photons, which strongly limits versatility resulting states. Nonlinear metasurfaces, due to their subwavelength thickness, relax this constraint extend boundaries engineering. Here, we...
Here we present a roadmap on Photonic metasurfaces. This document consists of number perspective articles different applications, challenge areas or technologies underlying photonic Each will introduce the topic, state art as well give an insight into future direction subfield.
Nonlinear phenomena are central to modern photonics but, being inherently weak, typically require gradual accumulation over several millimeters. For example, second harmonic generation (SHG) is achieved in thick transparent nonlinear crystals by phase-matching energy exchange between light at initial, ω, and final, 2ω, frequencies. Recently, metamaterials imbued with artificial nonlinearity from their constituent nanoantennas have generated excitement opening the possibility of...
Ultrafast optical excitation of select materials gives rise to the generation broadband terahertz (THz) pulses. This effect has enabled field THz time-domain spectroscopy and led discovery many physical mechanisms behind generation. However, only a few possess required properties generate radiation efficiently. Optical metasurfaces can relax stringent material requirements by shifting focus onto engineering local electromagnetic fields boost Here we demonstrate pulses in 160 nm thick...
The effect of terahertz (THz) pulse generation has revolutionized broadband coherent spectroscopy and imaging at THz frequencies. However, pulses typically lack spatial structure, whereas structured beams are becoming essential for advanced applications. Nonlinear optical metasurfaces with nanoscale emitters can provide a solution by defining the beam structure stage. We develop nonlinear InAs metasurface consisting resonators simultaneous structuring beams. find that in is governed...
Precise control of light–matter interactions at the nanoscale lies heart nanophotonics. However, experimental examination this length scale is challenging since corresponding electromagnetic near-field often confined within volumes below resolution conventional optical microscopy. In semiconductor nanophotonics, fields are further restricted confines individual subwavelength resonators, limiting access to critical in these structures. work, we demonstrate that photoelectron emission...
Since the discovery of laser, optical nonlinearities have been at core efficient light conversion sources. Typically, thick transparent crystals or quasi-phase matched waveguides are utilized in conjunction with phase-matching techniques to select a single parametric process. In recent years, due rapid developments artificially structured materials, frequency mixing has achieved nanoscale subwavelength resonators arrayed as metasurfaces. Phase matching becomes relaxed for these...
Optical antennas transform light from freely propagating waves into highly localized excitations that interact strongly with matter. Unlike their radio frequency counterparts, optical are nanoscopic and high frequency, making amplitude phase measurements challenging leaving some information hidden. Here we report a novel spectral interferometric microscopy technique to expose the response of individual across an octave visible near-infrared spectrum. Although it is far-field technique, show...
Ultrafast pulse characterization requires the analysis of correlation functions generated by frequency mixing optical pulses in a nonlinear medium. In this work, we use gold nanoantenna to generate simultaneously Four Wave Mixing and Sum Frequency Generation across tuning range Ti:Sapphire Optical Parametric Oscillator (OPO) system. Since metal nanoparticles create remarkably strong responses for their size without need phase matching, allows us characterize unknown OPO its pump using single...
Nanoscale optical antennas mediate frequency mixing processes via their modes. Within arrays, metasurfaces provide unique opportunities to control nonlinear processes. Macroscopic interpretations have so far prevailed, relying on arguments of underlying antenna symmetry. In this article, we show where such break down. We construct gradient produce diffraction orders both second-harmonic and four-wave-mixing radiation. However, find that higher order modes are required explain the presence...
Chromatic aberration in optical systems arises from the wavelength dependence of a glass's refractive index. Polychromatic rays incident upon an surface are refracted at slightly different angles and traversing system follow distinct paths creating images displaced according to color. Although arising dispersion, it manifests as spatial distortion correctable only with compound lenses multiple glasses accumulates complicated imaging systems. While chromatic is measured interferometry, simple...
Hot-electron generation has been a topic of intense research for decades numerous applications ranging from photodetection and photochemistry to biosensing. Recently, the technique hot-electron using non-radiative decay surface plasmons excited by metallic nanoantennas, or meta-atoms, in metasurface attracted attention. These metasurfaces can be designed with thicknesses on order diffusion length. The plasmonic resonances these ultrathin tailored changing shape size meta-atoms. One...
We describe a novel undergraduate research project that highlights the physics of metamaterials with acoustic waves and soda cans. confirm Helmholtz resonance nature single can by measuring its amplitude phase response to sound wave. Arranging multiple cans in arrays smaller than wavelength, we then design an antenna redirects into preferred direction. The be thought as new resonator, composed artificially engineered meta-atoms, similar metamaterial. These experiments are illustrative,...
We demonstrate a method to extract absorption and scattering from phase intensity measurements of extinction single optical nano-antenna by developing novel spectrally resolved interferometer integrated within confocal microscope.
We use complete polarization tomography of photon pairs generated in semi-conductor metasurfaces via spontaneous parametric down-conversion to show how bound states the continuum resonances affect state emitted photons.
Metasurfaces are highly effective at manipulating classical light in the linear regime; however, effectively controlling polarization of non-classical generated from nonlinear resonant metasurfaces remains a challenge. Here, we present solution by achieving engineering frequency-nondegenerate biphotons emitted via spontaneous parametric down-conversion (SPDC) GaAs metasurfaces, where quasi-bound states continuum (qBIC) resonances were utilized for boosting biphoton generation. By performing...
Metasurfaces are highly effective at manipulating classical light in the linear regime; however, effectively controlling polarization of nonclassical generated from nonlinear resonant metasurfaces remains a challenge. Here, we present solution by achieving engineering frequency-nondegenerate biphotons emitted via spontaneous parametric down-conversion GaAs metasurfaces, utilizing quasi-bound states continuum (qBIC) resonances to enhance biphoton generation. Through comprehensive tomography,...
Dielectric metasurfaces control optical wavefronts via nanoscale resonators laid out across a surface. However, most are, by design, planar. In this work, we demonstrate the ability to fabricate dielectric with vertically oriented using membrane projection lithography. We first numerically characterize resonant modes of an array germanium ellipses no substrate and identify narrowband region where satisfy Kerker condition. then seven depositing onto walls 3D micrometer-sized silicon nitride...
We demonstrate a method to extract absorption and scattering from phase intensity measurements of extinction single optical nano-antenna by developing novel spectrally resolved interferometer integrated within confocal microscope.
We demonstrate a novel method to measure chromatic aberrations of microscope objectives with metallic nano-particles using incoherent white light. Extinction spectra are recorded while scanning single nano-particle through lens's focal plane. show direct correlation between the wavelength and longitudinal shift analysis variations scanned extinction at each scan position peak over entire scan. The has been tested on achromat apochromat aluminum nano-particles.
A recurring theme in optics and photonics is the ability of metal nanostructures to imbue artificial materials with new functions. Metallic nano-antennas [1], so-called meta-atoms, are building blocks such metamaterials that boast unusual linear [2, 3] nonlinear [4– 6] characteristics not observed natural materials. Recently, have generated considerable excitement; while effects must gradually accumulate weak nonlinearity across macroscopic crystal dimensions, a small volume metamaterial [7,...