A5063482909- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Metamaterials and Metasurfaces Applications
- High-Velocity Impact and Material Behavior
- Solid State Laser Technologies
- Energetic Materials and Combustion
- Orbital Angular Momentum in Optics
- Electromagnetic Launch and Propulsion Technology
- Optical Network Technologies
- Advanced Antenna and Metasurface Technologies
- Advanced Fiber Optic Sensors
- Nonlinear Dynamics and Pattern Formation
- Hydrogen Storage and Materials
- Quantum optics and atomic interactions
- High-pressure geophysics and materials
- Inorganic Fluorides and Related Compounds
- Mechanical and Optical Resonators
- Metal and Thin Film Mechanics
- Slime Mold and Myxomycetes Research
- Quantum Information and Cryptography
- Surface Treatment and Residual Stress
Harvard University
2017-2025
Harvard University Press
2019-2025
IMEC
2024
TU Wien
2021-2024
University of Applied Sciences Technikum Wien
2022
ORCID
2021
ETH Zurich
2015-2019
All-Russian Scientific Research Institute of Technical Physics
2006-2018
Institute of Experimental Physics of the Slovak Academy of Sciences
2014
Russian Venture Company
2007
Abstract Metasurfaces are arrays of subwavelength spaced nanostructures that can manipulate the amplitude, phase, and polarization light to achieve a variety optical functions beyond capabilities 3D bulk optics. However, they suffer from limited performance efficiency when multiple with large deflection angles required because non-local interactions due coupling between not fully considered. Here we introduce method based on supercell metasurfaces demonstrate independent at arbitrary high...
Electro-optic modulators are essential for sensing, metrology and telecommunications. Most target fiber applications. Instead, metasurface-based architectures that modulate free-space light at gigahertz (GHz) speeds can boost flat optics technology by microwave electronics active optics, diffractive computing or optoelectronic control. Current realizations bulky have low modulation efficiencies. Here, we demonstrate a hybrid silicon-organic metasurface platform leverages Mie resonances...
Abstract High-quality optical ring resonators can confine light in a small volume and store it for millions of roundtrips. They have enabled the dramatic size reduction from laboratory scale to chip level filters, modulators, frequency converters, comb generators visible near-infrared. The mid-infrared spectral region (3−12 μm), as important is molecular gas sensing spectroscopy, lags behind development integrated photonic components. Here we demonstrate integration directional couplers,...
Quantum cascade laser (QCL) frequency combs offer the potential for building ultra-compact broadband spectrometers operating in mid-infrared spectral region, where many light molecules have their fundamental absorption bands. However, key characteristics must be improved correctly addressing comb spectroscopy applications. In this work, we investigate how device dispersion influences operation of QCLs. We measure group delay such a while just below threshold. then show that by implementing...
In standing-wave lasers, spatial hole burning induces a static grating of the population inversion, enabling multimode operation with several independent lasing modes. presence mode-locking mechanism, these modes may become correlated, giving origin to frequency comb. Quantum cascade owing their ultrafast gain dynamics, are ideally suited achieve comb operation. Here we experimentally demonstrate that quantum laser coherently beat produce time-dependent inversion gratings, which spatially...
The recently discovered ability of the quantum cascade laser to produce a harmonic frequency comb has attracted new interest in these devices for both applications and fundamental physics. In this review we present an extensive experimental phenomenology state, including its appearance mid-infrared terahertz lasers, studies destabilization induced by delayed optical feedback, assessment nature. A theoretical model explaining origin as due mutual interaction population gratings pulsations...
Laser dynamics encompasses universal phenomena that can be encountered in many areas of physics, such as bifurcation and chaos, mode competition, resonant nonlinearities, synchronization---or locking---of oscillators. When a locking process occurs multimode laser, an optical frequency comb is produced, which spectrum consisting equidistant modes with fixed phase relationship. Describing the formation self-starting combs terms fundamental laser equations governing field inside cavity does not...
Phase singularities are loci of darkness surrounded by monochromatic light in a scalar field, with applications optical trapping, super-resolution imaging, and structured light-matter interactions. Although 1D singular structures, like vortices, common due to their robust topological properties, uncommon 0D (point) 2D (sheet) can be generated wavefront-shaping devices metasurfaces. With the design flexibility metasurfaces, we deterministically position ten identical point using single...
Cluster synchronization is a general phenomenon in network of non-locally coupled oscillators. Here, we show that cluster occurs semiconductor lasers, where the beat notes between pairs adjacent longitudinal modes laser cavity constitute collection phase Non-local coupling arises from standing-wave nature with finite mirror reflectivities, which can actively control. Varying coupling, bring into state two note families oscillate at distinct collective frequencies. Using coherent detection...
Coupling is an essential mechanism that drives complexity in natural systems, transforming single, noninteracting elements into intricate networks with rich physical properties. Here, we demonstrate a chip-scale coupled laser system exhibits complex optical states impossible to achieve uncoupled system. We show pair of semiconductor ring lasers spontaneously forms frequency comb consisting the hybridized modes its cavity, exhibiting large number phase-locked tones anticross one another....
High-power, broadband frequency combs generated by semiconductor lasers have profound implications for on-chip spectroscopy. Here, we present a dry-etched racetrack quantum cascade laser that uses resonant radio-frequency injection to produce unidirectional walk comb at mid-infrared wavelengths. Efficient light outcoupling from the resonator provides more than 100 mW of continuous-wave output power room temperature, with beam quality on par Fabry--Perot lasers. Experimental waveform...
Dual-comb spectroscopy is emerging as one of the most appealing applications mid-infrared frequency combs for high-resolution molecular spectroscopy, it leverages on unique coherence properties combined with high sensitivities achievable by spectroscopy. Here we present an on-chip dual-comb source based quantum cascade laser combs, where two are integrated a single chip. Control repetition and offset frequencies obtained integrating micro-heaters next to each laser. We show that full control...
A monochromatic wave that circulates in a nonlinear and dispersive optical cavity can become unstable form structured waveform. This phenomenon, known as modulation instability, was encountered fiber lasers, optically pumped Kerr microresonators and, most recently, monolithic ring quantum cascade lasers (QCLs). In QCLs, the instability led to generation of fundamental frequency combs—optical fields repeat themselves once per round trip. Here we show same may also result self-starting...
Self-starting harmonic frequency combs in quantum cascade lasers exhibit skipping of several tens longitudinal modes the cavity, producing widely spaced which may be used for a number applications, such as generation high-spectral-purity microwave and terahertz tones. Under pure electrical injection, spacing is fixed by fundamental laser parameters can hardly controlled. Here, we demonstrate that induced optical injection an external seed provided tunable source. This scheme enables wide...
The linewidth enhancement factor (LEF) has recently moved into the spotlight of research on frequency comb generation in semiconductor lasers. Here we present a novel modulation experiment that enables direct measurement spectrally resolved LEF laser comb. By utilizing phase-sensitive technique, are able to extract for each individual mode any type. We first investigate and verify this universally applicable technique using Maxwell–Bloch simulations. Following, experimental demonstration...
Interference of laser beams in a suitable medium creates dynamic optical gratings, which can serve for wide variety applications, ranging from real-time holography to ultrasound generation. Typically, the interference occurs sample material that is separated sources. Here, we explore new aspect laser-induced gratings: microwave generation occurring inside cavity semiconductor frequency comb generators, such as quantum cascade lasers and interband lasers. The interplay between light...
Optical frequency combs (OFCs) stand as the cornerstone of modern optics, with applications ranging from fundamental science to sensing and spectroscopy. Generation short optical soliton pulses in passive media such fibers microresonators has been an established technique for stable OFC formation a broad spectrum – however these platforms are driven by external signal often rely on additional bulky elements that increase complexity system. Here, we aim overcome difficulties direct generation...