A5046767752- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Optical Network Technologies
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Advanced Photonic Communication Systems
- Advanced Fiber Optic Sensors
- Quantum optics and atomic interactions
- Semiconductor Lasers and Optical Devices
- Nonlinear Photonic Systems
- Quantum Information and Cryptography
- Photonic Crystals and Applications
- Photorefractive and Nonlinear Optics
- Nonlinear Dynamics and Pattern Formation
- Spectroscopy and Laser Applications
- Solid State Laser Technologies
- Neural Networks and Reservoir Computing
- Cancer Treatment and Pharmacology
- Diamond and Carbon-based Materials Research
- Laser Design and Applications
- Terahertz technology and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Laser Material Processing Techniques
- Silicon Nanostructures and Photoluminescence
Columbia University
2016-2025
Applied Mathematics (United States)
2016-2023
National Institute for Materials Science
2023
Gorgias Press (United States)
2019
Integrated Optoelectronics (Norway)
2019
Cornell University
2007-2016
University of Rochester
1987-2002
Golder Associates (Canada)
1991
Applied Energetics (United States)
1990
Rochester Institute of Technology
1990
We demonstrate broadband frequency comb generation in the mid-infrared (MIR) from 2.3 to 3.5 μm a Si(3)N(4) microresonator. engineer dispersion of structure MIR using Sellmeier equation we derive experimental measurements performed on films UV IR. use deposition-anneal cycling decrease absorption losses due vibrational transitions and achieve Q-factor 1.0×10(6). To our knowledge, this is highest Q reported wavelength range for any on-chip resonator.
We investigate theoretically the self-focusing dynamics of an ultrashort laser pulse both near and above threshold at which effectively undergoes catastrophic collapse. find that, as a result space-time focusing self-steepening, "optical shock" wave forms inside medium that gives rise to broad blueshifted pedestal in transmitted spectrum. Our results are good agreement with primary features observed experiments thus provide theoretical understanding for underlying process "white-light" generation.
On-chip optical resonators have the promise of revolutionizing numerous fields including metrology and sensing; however, their losses always lagged behind larger discrete resonator counterparts based on crystalline materials flowable glass. Silicon nitride (Si3N4) ring open up capabilities for routing, frequency comb generation, clocks high precision sensing an integrated platform. However, simultaneously achieving quality factor confinement in Si3N4 (critical nonlinear processes example)...
We demonstrate a frequency comb spanning an octave via the parametric process of cascaded four-wave mixing in monolithic, high-Q silicon nitride microring resonator. The is generated from single-frequency pump laser at 1562 nm and spans 128 THz with spacing 226 GHz, which can be tuned slightly power. In addition, we investigate RF-noise characteristics find that operate low-noise state 30-dB reduction noise as into cavity resonance.
Optical frequency combs represent a revolutionary technology for high precision spectroscopy due to their narrow linewidths and precise spacing. Generation of such in the mid-infrared (IR) spectral region (2-20 um) is great interest presence large number gas absorption lines this wavelength regime. Recently, have been demonstrated MIR several platforms, including fiber combs, mode-locked lasers, optical parametric oscillators, quantum cascade lasers. However, these platforms are either...
We present the first experimental demonstration of anomalous group-velocity dispersion (GVD) in silicon waveguides across telecommunication bands. show that GVD such can be tuned from -2000 to 1000 ps/(nm*km) by tailoring cross-sectional size and shape waveguide.
A compact, integrated dual-comb source is developed on a single chip to demonstrate fast, real-time spectroscopy of materials.
Abstract The development of a spectroscopy device on chip that could realize real-time fingerprinting with label-free and high-throughput detection trace molecules represents one the big challenges in sensing. Dual-comb (DCS) mid-infrared is powerful technique offering high acquisition rates signal-to-noise ratios through use only single detector no moving parts. Here, we present nanophotonic silicon-on-insulator platform designed for (mid-IR) DCS. A continuous-wave low-power pump source...
.We experimentally study the generation of correlated pairs photons through four-wave mixing (FWM) in embedded silicon waveguides. The waveguides, which are designed to exhibit anomalous group-velocity dispersion at wavelengths near 1555 nm, allow phase matched FWM and thus efficient pair-wise non-degenerate signal idler photons. Photon counting measurements yield a coincidence-to-accidental ratio (CAR) around 25 for (idler) photon production rate about 0.05 per pulse. We characterize...
We demonstrate highly broad-band frequency conversion via four-wave mixing in silicon nanowaveguides. Through appropriate engineering of the waveguide dimensions, bandwidths greater than 150 nm are achieved and peak efficiencies -9.6 dB demonstrated. Furthermore, utilizing fourth-order dispersion, wave-length across four telecommunication bands from 1477 (S-band) to 1672 (U-band) is demonstrated with an efficiency -12 dB.
We demonstrate second- and third-harmonic generation in a centrosymmetric CMOS-compatible material using ring resonators integrated optical waveguides. The χ(2) response is induced by the nanoscale structure of waveguide to break bulk symmetry silicon nitride (Si3N4) with dioxide (SiO2) cladding. Using high-Q resonator cavity enhance efficiency process, we detect second-harmonic output visible wavelength range milliwatt input powers at telecom wavelengths. also observe from intrinsic χ(3)...
We demonstrate parametric wavelength conversion via four-wave mixing using ultra-low peak pump powers of a few milliwatts in micrometer-scale silicon device. The response time our device is 100 ps allowing for implementation high-bandwidth optical communications. At these power levels and microscale sizes, it should be possible to realize hundreds devices operating simultaneously on single chip.
Manipulation and characterization of information using ultrafast optical signals is critical for numerous applications in telecommunications, biology, quantum science, spectroscopy, atomic molecular physics. Femtosecond pulsed laser sources are available over a wide range wavelengths repetition rates, which enable the generation, transmission, at bandwidths beyond 1 THz. In this article, we review concept space–time duality as system design tool processing characterization. The combination...
We report the first demonstration of thermally controlled soliton modelocked frequency comb generation in microresonators. By controlling electric current through heaters integrated with silicon nitride microresonators, we demonstrate a systematic and repeatable pathway to single- multi-soliton states without adjusting pump laser wavelength. Such an approach could greatly simplify combs facilitate applications such as chip-based dual-comb spectroscopy.
We investigate simultaneously the temporal and optical radio-frequency spectral properties of parametric frequency combs generated in silicon-nitride microresonators observe that system undergoes a transition to mode-locked state. demonstrate generation sub-200-fs pulses at repetition rate 99 GHz. Our calculations show pulse this is consistent with soliton modelocking. Ultimately, such devices offer potential producing ultra-short laser from visible mid-infrared regime rates GHz THz.