A5059050628- Spectroscopy Techniques in Biomedical and Chemical Research
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Spectroscopy and Chemometric Analyses
- Infection Control and Ventilation
- Orbital Angular Momentum in Optics
- Image Enhancement Techniques
- Random lasers and scattering media
- Spectroscopy and Laser Applications
- Photoacoustic and Ultrasonic Imaging
- Laser-induced spectroscopy and plasma
- Nanocluster Synthesis and Applications
- Terahertz technology and applications
- Advanced Optical Sensing Technologies
- Skin Protection and Aging
Texas A&M University
2017-2021
10X Genomics (United States)
2021
Russian Quantum Center
2020
Combined optical nonlinearity of bound and free electrons in a fast-ionizing medium driven by ultrashort, mid-infrared (mid-IR) pulses gives rise to vast variety ultrafast nonlinear-optical scenarios, producing bright, broadband radiation spectral ranges as different ultraviolet (UV) terahertz (THz). Given its enormous bandwidth, quantitative experimental analysis this type nonlinear response is anything but simple. Here, we confront challenge ultrabroadband measurements performed across the...
Raman spectroscopy is a powerful tool for molecular chemical analysis and bioimaging, which shows an astonishing sensitivity when combined with huge enhancement by the coherence surface effects. Noble metal nanoparticles have been commonly used spontaneous surface-enhanced scattering (SERS) coherent anti-Stokes (SECARS) spectroscopies, as they provide large factors via electromagnetic mechanisms. Recently, two-dimensional (2D) semiconductors, such monolayer molybdenum disulfide (MoS2), were...
Coherent-wake plasma emission induced by ultrashort mid-infrared laser pulses on a solid target is shown to give rise high-brightness, high-order harmonic radiation, offering promising source of attosecond and probe for ultrafast subrelativistic dynamics. With 80-fs, 0.2-TW 3.9-μm radiation used as driver, optical harmonics up the 34th order are detected, with their spectra stretching from region extreme ultraviolet region. The spectrum found be highly sensitive chirp driver....
We present a narrowband laser system tunable from 219 to 236 nm for deep ultraviolet (DUV) Raman spectroscopy. The demonstrated produces 6.7 ps nearly transform-limited pulses with energy up 0.36 µJ at 100 kHz repetition rate. consists of two-stage optical parametric amplifier (OPA) continuous wave diode and subsequent frequency conversion the DUV radiation. achieve more than 300 mW in signal using ${{\rm LiB}_3}{{\rm O}_5}$LiB
We investigate the possibility of tailoring coherent Raman generated spectra via adaptive wavefront optimization. Our technique combines a spatial light modulator and spectrometer providing feedback loop. The algorithm is capable controlling generation, producing broader an improved overall efficiency, increasing intensity high-order sidebands. Moreover, by optimization we can extend towards blue spectral region increase total power Mutual coherence equal frequency separation multiple...
We examine the concentration dependence of Coherent Anti-Stokes Raman Scattering (CARS) signal obtained for gas mixtures at various conditions using Femtosecond Adaptive Spectroscopic Technique (FAST). use CARS Q-branch vibrational oscillation molecular oxygen (1556 cm−1) to confirm quadratic coherent on number molecules in a test volume. In addition, we demonstrate multi-shot FAST imaging flow free space by raster-scanning area interest.
Raman scattering is a powerful instrument for spectroscopic sensing, which offers superb selectivity but typically at the expense of low signal and long collection times. In this paper we discuss mechanisms enhancement that dramatically improve performance systems. Several approaches, as well their combinations are considered. One approach to produce coherence; other approaches exploit advantages nanosized antenna-like structures, or employ wavefront shaping applied laser beams. Combining...
Raman spectroscopy provides a non-invasive, chemically-specific optical imaging of biological objects without relying on endogenous labels. Nonlinear allows non-invasive at much faster speed with an improved spatial resolution and axial sectioning capability. In this report we propose novel use nonlinear as sensor local nano-environment. Time-resolved coherent anti-Stokes spectrograms are found to be sensitive small variations structural changes, which not normally observed using...
Abstract As the Coronavirus 2019 pandemic creates worldwide shortages of personal protective equipment, hospitals have increasingly turned to sterilization and re-use protocols, often without significant data supporting specific methodologies. When using UV-C irradiation, previously shown be effective for decontaminating hard surfaces, modeling shows importance accounting porosity non-uniform curvature N95 masks in decontamination procedures. Data a standard incident dose 1 J/cm 2 delivered...
We demonstrate that the wavefront optimization algorithm with feedback loop allows extension of total bandwidth coherent Raman sidebands towards UV wavelengths, which will provide broader bandwidths for subcycle UV-VIS-NIR pulse synthesis.
We demonstrate the surface enhancement of coherent anti-Stokes Raman scattering (CARS) on pyridine-ethanol solution by MoS2 nanoparticles. The time resolved CARS measurements reveal increased dephasing rates pyridine vibrational modes.
We investigated the possibility of making ever-shorter optical pulses by using nonlinearity ambient air. produced a broad spectrum consisting mutually coherent sidebands via collinear Raman generation driven two picosecond laser that are Raman-resonant with molecular vibrations nitrogen. demonstrated ability to adjust sideband phases dispersion control which we accomplished changing path length generated multi-color beam through pair tilted glass plates. The resultant measured suggest 3-fs...
High-order harmonic generation (HHG) is one of the central effects in strong-field nonlinear-optical physics [1]. Within past two decades, HHG has been at heart a paradigm-shifting breakthrough to attosecond [2]. Much less limelight given ability serve as highly sensitive and many ways unique analytical tool. When used this modality, can help detect understand ultrafast electron dynamics complex gas-phase, solid-state, laser-plasma systems [3]. Here, we extend concept by using probe for...
Coherent Raman microspectroscopy utilizing either stimulated scattering or coherent is gaining popularity in the field of biological imaging. It generally assumed that spectroscopy provides a stronger signal than conventional based on spontaneous scattering, allowing much faster In this report we examine non-trivial advantages microspectroscopy, which haven't been given significant attention lately. particular, demonstrate potential improving sensitivity and ability to sense local nanoenvironment.