A5025237586- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Neural Networks and Reservoir Computing
- Advanced Memory and Neural Computing
- Photorefractive and Nonlinear Optics
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Spectroscopy and Laser Applications
- Advanced Photonic Communication Systems
- Photonic Crystals and Applications
- Semiconductor Quantum Structures and Devices
- Superconducting and THz Device Technology
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Mechanical and Optical Resonators
- Neural dynamics and brain function
- Photonic Crystal and Fiber Optics
- Optical Network Technologies
- Physics of Superconductivity and Magnetism
- Diamond and Carbon-based Materials Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Photoreceptor and optogenetics research
- Advanced Semiconductor Detectors and Materials
- Optical Coatings and Gratings
National Institute of Standards and Technology
2017-2024
Physical Measurement Laboratory
2018-2024
University of Central Florida
2013-2017
A platform for the realization of tightly-confined lithium niobate photonic devices and circuits on silicon substrates is reported based wafer bonding selective oxidation refractory metals. The heterogeneous employed to demonstrate high-performance microring optical resonators Mach-Zehnder modulators. quality factor ~7.2 × 10⁴ measured in microresonators, a half-wave voltage-length product 4 V.cm an extinction ratio 20 dB
Uncovering the nature of dark matter is one most important goals particle physics. Light bosonic particles, such as photon, are well-motivated candidates: they generally long-lived, weakly interacting, and naturally produced in early universe. In this work, we report on A^{'} Multilayer Periodic Optical SNSPD Target, a proof-of-concept experiment searching for photon eV mass range, via coherent absorption multilayer dielectric haloscope. Using superconducting nanowire single-photon detector...
Silicon-on-nitride ridge waveguides are demonstrated and characterized at mid- near-infrared optical wavelengths. thin films were achieved by bonding a silicon handling die to silicon-on-insulator coated with low-stress nitride layer. Subsequent removal of the substrate results in film on bottom cladding, readily available for waveguide fabrication. At mid-infrared wavelength 3.39 μm, fabricated have propagation loss 5.2 ± 0.6 dB/cm 5.1 transverse-electric transverse-magnetic modes, respectively.
Abstract Tremendous scientific progress has been achieved through the development of nonlinear integrated photonics. Prominent examples are Kerr frequency comb generation in microresonators, and supercontinuum conversion photonic waveguides. A high efficiency is enabling for applications optics, including such broad directions as high‐speed optical signal processing, metrology, quantum communication computation. In this work, a gallium‐arsenide‐on‐insulator (GaAs) platform photonics...
We report and characterize low-temperature, plasma-deposited deuterated silicon nitride films for nonlinear integrated photonics. With a peak processing temperature less than 300°C, it is back-end compatible with complementary metal-oxide semiconductor substrates. achieve microresonators quality factor of up to 1.6×106 at 1552 nm >1.2×106 throughout λ=1510-1600 nm, without annealing or stress management (film thickness 920 nm). then demonstrate the immediate utility this platform in...
Optical communication achieves high fanout and short delay advantageous for information integration in neural systems. Superconducting detectors enable signaling with single photons maximal energy efficiency. We present designs of superconducting optoelectronic neurons based on single-photon detectors, Josephson junctions, semiconductor light sources, multi-planar dielectric waveguides. These circuits achieve complex synaptic neuronal functions efficiency, leveraging the strengths...
The microscale integration of mid- and long-wave-infrared photonics could enable the development fieldable, robust chemical sensors, as well highly efficient infrared frequency converters. However, such technology would be defined by choice material platform, which immediately determines strength types optical nonlinearities available, transparency window, modal confinement, physical robustness. In this work, we demonstrate a new suspended AlGaAs waveguides integrated on silicon, providing...
We report on the fabrication and characterization of single-photon-sensitive WSi superconducting detectors with wire widths from 1 μm to 3 μm. The devices achieve saturated internal detection efficiency at a wavelength 1.55 exhibit maximum count rates in excess 105 s−1. also investigate material properties silicon-rich films used for these devices. find that many active lengths several hundred micrometers critical currents 50% depairing current. A meandered detector 2.0 width is demonstrated...
The Origins Space Telescope mission concept includes an exoplanet transit spectrometer that requires detector arrays with ultrahigh pixel-to-pixel stability. Superconducting nanowire single-photon detectors, or SNSPDs, have the potential to meet these stringent stability requirements due their digital-like output. Traditionally used for applications at near-IR telecom wavelengths, SNSPDs demonstrated near-unity detection efficiencies, ultralow dark-count rates, and high dynamic ranges. Until...
Laser frequency combs, with their unique combination of precisely defined spectral lines and broad bandwidth, are a powerful tool for basic applied spectroscopy. Here, we report offset-free, mid-infrared combs dual-comb spectroscopy through supercontinuum generation in silicon-on-sapphire waveguides. We leverage robust fabrication geometrical dispersion engineering nanophotonic waveguides multi-band, coherent spanning 70 THz the (2.5 μm–6.2 μm). Precise waveguide provides significant...
We design, fabricate, and characterize integrated photonic routing manifolds with 10 inputs 100 outputs using two vertically planes of silicon nitride waveguides. analyze via top-view camera imaging. This measurement technique allows the rapid acquisition hundreds precise transmission measurements. demonstrate uniform Gaussian power distribution patterns mean output errors (averaged over sets inputs) 0.7 0.9 dB, respectively, establishing this as a viable architecture for precision light...
We propose and experimentally demonstrate a photonic routing architecture that can efficiently utilize the space of multi-plane (3D) integration. A wafer with three planes amorphous silicon waveguides was fabricated characterized, demonstrating <3×10−4 dB loss per out-of-plane waveguide crossing, 0.05±0.02 interplane coupler, microring resonators on quality factors up to 8.2×104. also explore phase velocity mapping strategy mitigate cross talk between co-propagating different planes....
Nanophotonic waveguides with sub-wavelength mode confinement and engineered dispersion profiles are an excellent platform for application-tailored nonlinear optical interactions at low pulse energies.Here, we present fully air clad suspended-silicon infrared frequency comb generation bandwidth limited only by the silicon transparency.The achieved spectra lithographically tailored to span 2.1 octaves in mid-infrared (2.0-8.5 µm or 1170-5000 cm -1 ) when pumped 3.10 100 pJ pulses.Novel...
Superconducting nanowires, a mature technology originally developed for quantum sensing, can be used as target and sensor with which to search dark matter interactions electrons. Here we report on 180-hour measurement of tungsten silicide superconducting nanowire device mass 4.3 nanograms. We use this place new constraints matter–electron interactions, including the strongest terrestrial date sub-MeV (sub-eV) that interacts electrons via scattering (absorption) processes.Received 5 November...
We demonstrate adiabatically tapered fibers terminating in sub-micron tips that are clad with a higher-index material for coupling to an on-chip waveguide. This cladding enables high-index waveguide without losing light the buried oxide. A technique tip of fiber polymer is introduced. Conventional waveguides and forked structures investigated from find facilitates alignment packaging, while conventional taper leads higher bandwidth. The insertion loss through coupler silicon nitride 1.1 dB 3...
This roadmap consolidates recent advances while exploring emerging applications, reflecting the remarkable diversity of hardware platforms, neuromorphic concepts, and implementation philosophies reported in field. It emphasizes critical role cross-disciplinary collaboration this rapidly evolving
Abstract We investigate material properties in Mo x Si 1− thin films with the goal of optimization for single-photon detection from UV to mid-IR wavelengths. Saturated internal efficiency appears be related film structure this material. demonstrate nanometer-wide meander devices saturated at 370 nm wavelength and 3.4 K operation temperature. By reducing thickness optimized material, we 1550 1 temperature micron-wide shaped detectors wire widths up 2.0 μ m active areas 362 × 2 .
Submicron tantalum pentoxide ridge and channel optical waveguides microring resonators are demonstrated on silicon substrates by selective oxidation of the refractory metal, tantalum. The novel method eliminates surface roughness problem normally introduced during dry etching waveguide sidewalls also simplifies fabrication directional couplers. It is shown that measured propagation loss independent structure thereby limited material in core regions. achieved have cross-sectional dimensions...
Nonlinear frequency conversion plays a crucial role in advancing the functionality of next-generation optical systems. Portable metrology references and quantum networks will demand highly efficient second-order nonlinear devices, intense interactions nanophotonic waveguides can be leveraged to meet these requirements. Here we demonstrate second harmonic generation (SHG) GaAs-on-insulator with unprecedented efficiency 40 W$^{-1}$ for single-pass device. This result is achieved by minimizing...
Defect centers are promising candidates for waveguide-integrated silicon light sources. We demonstrate microresonator- and waveguide-coupled photoluminescence from W~centers. Microphotoluminescence measurements indicate wavelengths on-resonance with resonator modes preferentially coupled to an adjacent waveguide. Quality factors of at least 5,300 measured, free spectral ranges closely match expectation. The W~center phonon sideband can be used as a diagnostic broader range waveguide-based...
We present a hybrid fiber/waveguide design for 100-MHz frequency comb that is fully self-referenced and temperature controlled with less than 5 W of electrical power. Self-referencing achieved by supercontinuum generation in silicon nitride waveguide, which requires much lower pulse energies (~200 pJ) highly nonlinear fiber. These low-energy pulses are an erbium fiber oscillator/amplifier pumped two 250-mW passively-cooled pump diodes consume The tuning the oscillator, necessary to stabilize...
We demonstrate a polarization rotator integrated at the output of GaAs waveguide producing type I second harmonic generation (SHG). Form-birefringent phase matching between pump fundamental transverse electric (TE) mode near 2.0 µm wavelength and signal magnetic (TM) efficiently generates light 1.0 wavelength. A SiN layer is with SHG device to form multifunctional photonic circuit. The couples two layers rotates from TM TE or TM. With TE-polarized pump, demonstrated rotated polarization....
We show several techniques for using integrated-photonic waveguide structures to simultaneously characterize multiple waveguide-integrated superconducting-nanowire detectors with a single fiber input. The first set of allows direct comparison detector performance various widths and lengths. second type demonstrated structure us achieve detection high dynamic range. This device small number count photons across many orders magnitude in rate. However, we find stray light floor -30 dB limits...
We have previously proposed a novel hardware platform (SOEN) for neuromorphic computing based on superconducting optoelectronics that presents many of the features necessary information processing in brain. Here we discuss design and training networks neurons synapses this technology. present circuit models simplest can use to build networks. further abstracted integrate fire model evolutionary optimization small these neurons. show TENNLab programming framework logic, control classification...