A5033812299- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Advanced Fiber Optic Sensors
- Photorefractive and Nonlinear Optics
- Human-Automation Interaction and Safety
- Advanced Fluorescence Microscopy Techniques
- Electric Motor Design and Analysis
- Laser-Matter Interactions and Applications
- Magneto-Optical Properties and Applications
- Sensorless Control of Electric Motors
- Magnetic Bearings and Levitation Dynamics
- Advanced MEMS and NEMS Technologies
- Traffic and Road Safety
- Semiconductor Lasers and Optical Devices
- Visual perception and processing mechanisms
- Photonic Crystal and Fiber Optics
- Electrostatic Discharge in Electronics
- Electric and Hybrid Vehicle Technologies
- Orbital Angular Momentum in Optics
- Supercapacitor Materials and Fabrication
- Diamond and Carbon-based Materials Research
- Aerospace Engineering and Energy Systems
Johns Hopkins University Applied Physics Laboratory
2020-2022
Johns Hopkins University
2020
University of Rochester
2014-2019
DEVCOM Army Research Laboratory
2011-2012
Baldor Electric (United States)
2008
Old Dominion University
2008
Rockwell Automation (United States)
2006
Nonlinear wavelength conversion is essential for many classical and quantum pho-tonic applications. The underlying second-order nonlinear optical processes, however, generally exhibit limited spectral bandwidths that impact their application potential. Here we use a high-Q X-cut lithium niobate microdisk resonator to demonstrate both second-harmonic generation spontaneous parametric down-conversion on chip. In particular, our microresonator, with its wide-range cyclic phase matching rich...
We demonstrate a high-Q amorphous silicon carbide (a-SiC) microresonator with optical Q as high 1.3 × 10(5). The quality allows us to characterize the third-order nonlinear susceptibility of a-SiC. Kerr nonlinearity is measured be n2 = (5.9 ± 0.7) 10(−15) cm(2)/W in telecom band around 1550 nm. strong and render a-SiC microresonators promising platform for integrated photonics.
We propose to selectively engineer a single cavity resonance achieve frequency matching for optical parametric processes in high-Q microresonators. For this purpose, we demonstrate an approach, selective mode splitting (SMS), precisely shift targeted resonance, while leaving other modes intact. apply SMS efficient generation via four-wave mixing silicon The proposed approach is of great potential broad applications integrated nonlinear photonics.
Nonreciprocal optical systems have found many applications altering the linear transmission of light as a function its propagation direction. Here, we consider new class nonreciprocity which appears in photon pair correlations and not transmission. We experimentally demonstrate theoretically verify this second-order coherence functions pairs produced by spontaneous four-wave mixing silicon microdisk. Reversal pump direction can result substantial extinction without
Abstract Despite decades of research, the role gaze in car driving is still poorly understood, but racing simulators provide a suitable experimental platform to examine drivers' patterns across tasks increasing complexity, including at high speeds. In this article, we report findings our baseline study: as function speed and expertise straight-road braking. driving, was increasingly constrained by speed, higher levels relaxed constraint. However, drivers always preferred look direction their...
Integrated quantum photonics has recently attracted considerable attention due to the promise of realizing chip-scale information processing with unprecedented capability and complexity. Their implementation relies essentially on a high-quality photon source support diverse functionalities. Microresonator-based sources are promising solution for generating bright, pure, single-mode photons excellent power efficiencies. However, their low Klyshko efficiency, typically around few percentages,...
Abstract The Facility for Rare Isotope Beams (FRIB) began operation with 1 kW beam power scientific users in May 2022 upon completion of 8 years project construction. ramp-up to the ultimate 400 kW, planned over a 6-year period, will enable facility reach its full potential discovery isotope science and applications. In December 2023, record-high 10.4 uranium was delivered target. Technological developments accelerator improvements are being made entire key ramp-up. Major technological...
The present and future market for motors places a high value on operating efficiency, reliability, variable-speed operation, low running temperature, quiet cost. Permanent-magnet (PM) are now able to meet these expectations across an increasing range of ratings. Compared the prolific induction motor, PM provide attributes etc. They also have additional advantages higher power density, superior factor (low current), rotor synchronous operation. Advancement in magnet technologies allows...
Advances in quantum photonics have shown that chip-scale devices are translating from the realm of basic research to applied technologies. Recent developments integrated photonic circuits and single photon detectors indicate bottleneck for fidelity processes will ultimately lie with sources. We present demonstrate a silicon nanophotonic chip capable emitting telecommunication band pairs exhibit highest raw degree time-energy entanglement micro/nanoscale source, date. Biphotons generated...
We report the generation of high-purity twin photon pairs through cavity-enhanced non-degenerate four-wave mixing (FWM) in a high-Q silicon microdisk resonator. Twin are created within same cavity mode and consequently expected to be identical all degrees freedom. The device is able produce photons at telecommunication wavelengths with pair rate as large $(3.96\pm0.03)\times10^5 ~{\rm pairs/s}$, narrow bandwidth 0.72 GHz. A coincidence-to-accidental ratio $660\pm62$ was measured, highest...
Numerical simulations are used to solve the coupled partial differential equations describing stimulated Brillouin scattering (SBS) built up from random thermal phonons as a function of time and longitudinal spatial coordinate in an optical fiber. In case passive fiber, laser beam is incident with constant power, but its frequency linearly ramped at 1.55 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex...
The present and future market for motors places high value on operating efficiency, reliability, variable speed operation, low running temperature, quiet cost. Permanent magnet (PM) are now able to meet these expectations across an increasing range of ratings. Compared the prolific induction motor, PM provide attributes etc, plus have additional advantages higher power density, superior factor (low current), rotor synchronous operation. Advancement in technologies allows operation at...
We demonstrate the first silicon carbide (SiC) double-microdisk resonator (DMR). The device has a compact footprint with radius of 24 μm and operates in ITU high frequency range (3-30 MHz). develop multi-layer nanofabrication recipe that yields optical quality (Q∼105) for SiC DMR. Because its strong optomechanical interaction, we observe thermal-Brownian motions mechanical modes DMR directly at room temperature time, to best our knowledge. observed include fundamental/second-order common...
Abstract Many technologies emerging from quantum information science heavily rely upon the generation and manipulation of entangled states. Here, we propose demonstrate a new class interference phenomena that arise when states are created in coherently converted between propagating modes an optical microcavity. The modal coupling introduces several creation pathways to nonlinear process within device, which mechanically interfere drive system time domain. coherent conversion entangles...
Abstract Photonic sensors based upon high‐quality microcavities have found a wide variety of applications ranging from inertial sensing, electro‐ and magnetometry to chemical biological sensing. These dynamic range limited by the linewidth cavity mode transducing input. This not only determines signal strength that can be detected, but also affects resilience sensor against large deteriorating external perturbations shocks in practical environment. Unfortunately, there is general trade‐off...
Abstract In our previous research, we found that drivers when engaged in straight-road driving, and also braking, tend to look the direction of their intended movement regardless speed or expertise (Rogers, Kadar, & Costall, this issue). Furthermore, gaze is highly constrained suggesting control might be based on global optic flow. This study further investigates are braking front a vertical barrier either approaching orthogonally from right left. These three different directions approach...
The generation of high-voltage electrical pulses with very fast rise times is important for several pulsed-power applications. Although techniques and devices have been used to generate ultrashort rise-time pulses, most suffer from problems relating reliability, lifetime, power-handling capacity. Here, the concept using nonlinear transmission lines attaining pulse sharpening. Numerical simulations are carried out barium strontium titanate as dielectric system. based on voltage-dependent...
Generation of photons in controlled temporal modes is a key part connecting distant nodes quantum network built with atomic and cavity systems. For efficient coupling, such systems require narrowband specific spectral wavefunctions. To date, this has only been possible bulk optical setups, mostly for broadband light. Here researchers present chip-scale technique based on controlling the density states silicon whispering-gallery-mode resonator, using Rayleigh scattering. The generates...
A master-oscillator power-amplifier with stimulated Brillouin scattering (SBS) beam cleanup or wavefront reversal typically incorporates a Faraday isolator to outcouple the Stokes light, limiting power scalability. Volume Bragg gratings (VBGs) have potential for scaling higher powers. We report here results of tests on VBG designed resolve wavelengths 0.060 nm apart, corresponding 16 GHz frequency shift SBS backscattering at 1064 in fused silica. Such an element may also find use between...
The visualization of distinct molecular species represents an important challenge bio-imaging research. In past decades, the development multicolor fluorescent (FL) labels has greatly improved our ability to track biological analytes, paving way for advances in understanding cell dynamics. It remains challenging, however, visualize a large number different fluorephores simultaneously. Owing spectrally broad absorption dyes, only up five color categories can be resolved at once. Here, we...
Many technologies emerging from quantum information science heavily rely upon the generation and manipulation of entangled states. Here, we propose demonstrate a new class interference phenomena that arise when states are created in coherently converted between propagating modes an optical microcavity. The modal coupling introduces several creation pathways to nonlinear process within device, which mechanically interfere drive system time domain. coherent conversion entangles generated...
Photonic sensors based upon high-quality optical microcavities have found a wide variety of applications ranging from inertial sensing, electro- and magnetometry to chemical biological sensing. These dynamic range limited by the linewidth cavity mode transducing input. This not only determines signal strength that can be detected, but also affects resilience sensor large deteriorating external perturbations shocks in practical environment. Unfortunately, there is general trade-off between...