A5054689846- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Semiconductor Lasers and Optical Devices
- Advanced MEMS and NEMS Technologies
- Semiconductor Quantum Structures and Devices
- Quantum optics and atomic interactions
- Force Microscopy Techniques and Applications
- Quantum Information and Cryptography
- Laser-Matter Interactions and Applications
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Optic Sensors
- Neural Networks and Reservoir Computing
- Photonic Crystal and Fiber Optics
- Near-Field Optical Microscopy
- Spectroscopy and Laser Applications
- Atomic and Subatomic Physics Research
- Photorefractive and Nonlinear Optics
- Optical Coatings and Gratings
- Nonlinear Photonic Systems
- Cancer Treatment and Pharmacology
- Nonlinear Optical Materials Studies
- Plasmonic and Surface Plasmon Research
National Institute of Standards and Technology
2016-2025
University of Maryland, College Park
2018-2025
Joint Quantum Institute
2019-2025
Center for Nanoscale Science and Technology
2015-2024
NIST Center for Neutron Research
2024
National Institute of Standards
2009-2024
Periyar University
2024
Physical Measurement Laboratory
2019-2023
National Institute of Technology Tiruchirappalli
2023
University of Colorado Boulder
2021
Laboratory optical atomic clocks achieve remarkable accuracy (now counted to 18 digits or more), opening possibilities for exploring fundamental physics and enabling new measurements.However, their size the use of bulk components prevent them from being more widely adopted in applications that require precision timing.By leveraging silicon-chip photonics integration reduce component complexity, we demonstrate a compact optical-clock architecture.Here semiconductor laser is stabilized an...
A technique is demonstrated which efficiently transfers light between a tapered standard single-mode optical fiber and high-Q, ultra-small mode volume, silicon photonic crystal resonant cavity. Cavity quality factors of 4.7x10(4) are measured, total fiber-to-cavity coupling efficiency 44% demonstrated. Using this efficient cavity input output channel, the steady-state nonlinear absorption dispersion studied. Optical bistability observed for powers as low 250 microW, corresponding to dropped...
Abstract Today, surface acoustic waves (SAWs) and bulk are already two of the very few phononic technologies industrial relevance can been found in a myriad devices employing these nanoscale earthquakes on chip. Acoustic radio frequency filters, for instance, integral parts wireless devices. SAWs particular find applications life sciences microfluidics sensing mixing tiny amounts liquids. In addition to this continuously growing number applications, ideally suited probe control elementary...
Abstract Self-assembled, epitaxially grown InAs/GaAs quantum dots (QDs) are promising semiconductor emitters that can be integrated on a chip for variety of photonic information science applications. However, self-assembled growth results in an essentially random in-plane spatial distribution QDs, presenting challenge creating devices exploit the strong interaction single QDs with highly confined optical modes. Here, we present photoluminescence imaging approach locating respect to alignment...
Integrated photonics is at the heart of many classical technologies, from optical communications to biosensors, LIDAR, and data center fiber interconnects. There strong evidence that these integrated technologies will play a key role in quantum systems as they grow few-qubit prototypes tens thousands qubits. The underlying laser with required functionality performance, can only be realized through integration components onto photonic circuits (QPICs) accompanying electronics. In last decade,...
Recent advances in nonlinear optics have revolutionized integrated photonics, providing on-chip solutions to a wide range of new applications. Currently, state the art photonic devices are mainly based on dielectric material platforms, such as Si
Photonic integration is an enabling technology for photonic quantum science, offering greater scalability, stability, and functionality than traditional bulk optics. Here, we describe a scalable, heterogeneous III-V/silicon platform to produce Si$_3$N$_4$ circuits incorporating GaAs-based nanophotonic devices containing self-assembled InAs/GaAs dots. We demonstrate pure singlephoton emission from individual dots in GaAs waveguides cavities - where strong control of spontaneous rate observed...
Anomaly-based network intrusion detection systems are highly significant in detecting attacks. Robust machine learning and deep models for identifying attack types proposed this paper. Proposed have experimented with the UNSW-NB15 dataset of 49 features nine different samples. Decision Tree classifier produced best accuracy 99.05% compared to ensemble - Random forest(98.96%), Adaboost(97.87%), XGBoost(98.08%). K-Nearest Neighbour trained various values K performance obtained K=7 95.58%. A...
The design of high quality factor (Q) optical cavities in two dimensional photonic crystal (PC) slab waveguides based upon a momentum space picture is presented. results symmetry analysis defect modes hexagonal and square host lattices are used to determine cavity geometries that produce which by their very reduce the vertical radiation loss from PC slab. Further improvements Q achieved through tailoring geometry Fourier limit coupling between dominant components given mode those either not...
We combine photonic and electronic band structure engineering to create a surface-emitting quantum cascade microcavity laser. A high-index contrast two-dimensional crystal is used form micro-resonator that simultaneously provides feedback for laser action diffracts light vertically from the surface of semiconductor surface. top metallic contact allows electrical current injection vertical optical confinement through bound plasmon wave. The miniaturization tailorable emission properties this...
The quality factor (Q), mode volume (V(eff)), and room-temperature lasing threshold of microdisk cavities with embedded quantum dots (QDs) are investigated. Finite element method simulations standing wave modes within the reveal that Veff can be as small 2(lambda/n)(3) while maintaining radiation-limited Qs in excess 10(5). Microdisks diameter 2 microm fabricated an AlGaAs material containing a single layer InAs QDs peak emission at lambda = 1317 nm. For devices V(eff) ~2 (lambda/n)(3), high...
Microresonator frequency combs can be an enabling technology for optical synthesis and timekeeping in low size, weight, power architectures. Such systems require comb operation low-noise, phase-coherent states such as solitons, with broad spectral bandwidths (e.g., octave-spanning) self-referencing to detect the carrier-envelope offset frequency. However, stably accessing is complicated by thermo-optic dispersion. For example, Si3N4 platform, precisely dispersion-engineered structures...
We demonstrate optomechanically mediated electromagnetically induced transparency and wavelength conversion in silicon nitride (Si3N4) microdisk resonators. Fabricated devices support whispering gallery optical modes with a quality factor (Q) of 10(6), radial breathing mechanical Q=10(4) resonance frequency 625 MHz, so that the system is resolved sideband regime. Placing strong control field on red (blue) detuned mode produces coherent interference resonant probe beam, inducing (absorption)...
We show that quantum frequency conversion (QFC) can overcome the spectral distinguishability common to inhomogeneously broadened solid-state emitters. QFC is implemented by combining single photons from an InAs/GaAs dot (QD) at 980 nm with a 1550 pump laser in periodically poled lithium niobate (PPLN) waveguide generate 600 signal-to-background ratio exceeding $100\ensuremath{\mathbin:}1$. Photon correlation and two-photon interference measurements confirm both photon character wave packet...