A5030198328- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Semiconductor Quantum Structures and Devices
- Photonic and Optical Devices
- Nonlinear Optical Materials Studies
- Orbital Angular Momentum in Optics
- Semiconductor materials and devices
- Metamaterials and Metasurfaces Applications
- Electronic and Structural Properties of Oxides
- Plasmonic and Surface Plasmon Research
- Ocular and Laser Science Research
- Force Microscopy Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Photonic Crystal and Fiber Optics
- Laser-induced spectroscopy and plasma
- Surface and Thin Film Phenomena
- Photonic Crystals and Applications
- Semiconductor Lasers and Optical Devices
- Engineering and Material Science Research
- Laser Design and Applications
- Silicon Nanostructures and Photoluminescence
- Integrated Circuits and Semiconductor Failure Analysis
- Laser-Ablation Synthesis of Nanoparticles
The Ohio State University
2015-2021
BAE Systems (United States)
2019
Leipzig Heart Institute
2009
Abstract Time-dependent nonlinear media, such as rapidly generated plasmas produced via laser ionization of gases, can increase the energy individual photons and generate tunable high-order harmonic pulses. This phenomenon, known photon acceleration, has traditionally required extreme-intensity pulses macroscopic propagation lengths. Here, we report on a novel material—an ultrathin semiconductor metasurface—that exhibits efficient acceleration at low intensities. We observe signature...
Polycrystalline ZnSe is an exciting source of broadband supercontinuum and high-harmonic generation via random quasi phase matching, exhibiting broad transparency in the mid-infrared (0.5-20 μm). In this work, effects wavelength, pulse power, intensity, propagation length, crystallinity on high harmonic are investigated experimentally using ultrafast pulses. Observed conversion efficiency scales linearly reaching as 36%. For first time to our knowledge, n2 measured for wavelengths ZnSe:...
Although ultrafast laser materials processing has advanced at a breakneck pace over the last two decades, most applications have been developed with pulses near-IR or visible wavelengths. Recent progress in mid-infrared (MIR) femtosecond source development may create novel capabilities for material processing. This is because, high intensities required such processing, wavelength tuning to longer wavelengths opens pathway special regime of laser-solid interactions. Under these conditions,...
Mid-infrared (MIR) wavelengths (2–10 μμm) open up a new paradigm for femtosecond laser–solid interactions. On fundamental level, compared to the ubiquitous near-IR (NIR) or visible (VIS) laser interactions, MIR photon energies render semiconductors behave like high bandgap materials, while driving conduction band electrons harder due λ2 scaling of ponderomotive energy. From an applications perspective, many VIS/NIR opaque materials are transparent MIR. This allows sub-surface modifications...
Ultrafast bandgap photonics in mid-infrared is an exciting area of nonlinear photonics, which shows different ultrafast damage characteristics solids compared to that near-infrared fields. It allows periodic surface nano-structures formation low materials like germanium. field interaction at 2 micron wavelength with non-linear photonic crystal results generation high efficiency harmonic up sixth harmonic.
Single 5 and 40 femtosecond, near IR pulses with fluences varying from 0.4 – 80 J/cm<sup>2</sup> a Ti:Sapphire laser was focused onto single crystal Cu sample surface 2.0 μm focal spot at 15 45 degree angle of incidence. The profiles after interaction were studied an interferometric depth profiler (Wyko NT9100), benchmarked against crater size morphology predicted by 2D Particle-In-Cell (PIC) damage simulation model.
The Technological Application Programs Office (TAPO) is designing a replacement aircraft occupant ballistic protection system (AOBPS) in conjunction with group of Systems Engineering cadets at the United States Military Academy (USMA). are to assist TAPO recommending and developing Ballistic for 160th Special Operation Aviation Regiment (Airborne) (SOAR(A)).The objective project improve or replace heavy, steel BPS currently use on special operations rotary wing by increasing survivability...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text M. R. Shcherbakov, K. Werner, Z. Fan, N. Talisa, E. Chowdhury, and G. Shvets, "Nonlinear Manifestations of Photon Acceleration in Rapidly Evolving Semiconductor Metasurfaces," Conference Lasers Electro-Optics, OSA Terchnical Digest (online) (Optica Publishing Group, 2018), paper FTh1D.2. Export BibTex Endnote (RIS) HTML Plain alert Save article
We investigate the nonlinear optical properties of ZnSe and ZnS using ultrashort (pulse duration approximately 200 fs) midwave infrared laser pulses between 3 4 μm. Multiple harmonic generation in both materials was observed, as well significant spectral modification fundamental pulse. Simulations a polarization model enhanced with ionization compared favorably experimental data. Random quasi phase matching is likely generator observed harmonics.
Strong-field MIR laser-solid interactions have recently generated great interest. Harmonic continuum was in ZnSe with pulses. Power scaling of the harmonics non-perturbative conversion efficiency as high 26%.
Nonlinear refraction coefficients are measured via the Z-scan technique in mid-infrared spectral region for infrared transmitting materials. Harmonic and supercontinuum generation modeled using experimentally obtained values compared to experimental observations.
This work seeks to explore the interplay between material differences in nonlinear index of refraction <i>n</i><sub>2</sub> and zero group velocity dispersion wavelength λ<sub>GVD</sub> formation spectral broadening supercontinuum generation. We present mid-wave infrared (MWIR) spectroscopic data transmitted 200 fs (FWHM) laser pulse through polycrystalline zinc selenide sulfide (Cleartran™) optical materials. Using MWIR wavelengths 3.3 3.8 μm, we vary energy roughly 1 126 μJ...
High harmonic generation in polycrystalline ZnSe is modeled as an effective medium.The non-perturbative behavior observed experimentally was recreated, showing that model captures the underlying physics.
Using intense 3.6 μm, 200 fs, 500 Hz laser pulses, non-linear spectral broadening, filamentation and 2nd-9th harmonic generation in ZnS (Cleartran™) with 3-40 mm propagation distance were observed. Non-linear index of Cleartran was also measured.
Abstract We report scanning tunneling microscopy (STM) studies of individual adatoms deposited on an InSb(110) surface. The can be reproducibly dropped off from the STM tip by voltage pulses, and impact into surface up to ∼100×. spatial extent magnitude effect are widely tunable imaging conditions such as bias voltage, set current photoillumination. attribute occupation a (+/0) charge transition level, switching associated adatom-induced band bending. in topographic images is well reproduced...
The dynamics of the laser-solid interaction with high intensity ultra-short s-polarized few-cycle pulses (FCPs) (E<sub>photon</sub> ~ 1.65 eV) and single crystals (100) Si GaAs (E<sub>gap</sub> 1.14 1.4 eV, respectivly) near multipulse laser-induced damage threshold (LIDT) were measured using a pump-probe reflectivity technique. FCP's central wavelength 760 nm FWHM duration 5 fs used as both pump probe incident at 45°, each pulse was delay between varied 0.1 resolution. Near zero delay,...
We designed semiconductor metasurfaces comprised of rectangular arrays all-Si antennas exhibiting sharp transmission dips. The sizes and periodicities the were shown to control spectral positions linewidths corresponding antenna resonances. resonant fabricated on a 600-nm-thick silicon-on-sapphire substrate using electron beam lithography, hard mask deposition, inductively coupled HBr plasma etching. Multiple areas with different defined same substrate. samples characterized FTIR system...
Strong field mid-IR laser (λ = 2 − 4.2 µm, Δτ 100-200 fs) surface interactions were studied in Si, Ge, ZnSe, InSb. Periodic structures and features with sizes down to < λ/40 observed.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text N. Talisa, K. Werner, and E. Chowdhury, "Time-Resolved Surface Microscopy of Single Shot Few-Cycle Pulse Laser Ablation Layer TiO2 Thin Films," in Conference Lasers Electro-Optics, OSA Technical Digest (online) (Optica Publishing Group, 2018), paper SM3O.7. Export BibTex Endnote (RIS) HTML Plain alert Save article
The metasurface under study was engineered to enhance the local fields, which is crucial for efficiency of nonlinear photon conversion. In our design metasurface, we make use high-Q collective resonances common regular arrays semiconductor particles, as verified by MIR FTIR spectroscopy. We facricate 600-nm-thick silicon rectangles situated on a sapphire substrate. order demonstrate power- dependent blue-shifting THG, focused 200 ± 30 fs laser pulses centered at λ = 3.62 μm, with variable...