A5070295938- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Laser Applications
- Ultrasonics and Acoustic Wave Propagation
- Thermography and Photoacoustic Techniques
- Silicon and Solar Cell Technologies
- Electronic and Structural Properties of Oxides
- Photoacoustic and Ultrasonic Imaging
- Optical Imaging and Spectroscopy Techniques
- Quantum Information and Cryptography
- Plasmonic and Surface Plasmon Research
- Acoustic Wave Resonator Technologies
- Adaptive optics and wavefront sensing
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Quantum Chemical Studies
Vanderbilt University
2017-2020
The photoelastic phenomenon has been widely investigated as a fundamental elastooptical property of solids. This effect applied extensively to study stress distribution in lattice-mismatched semiconductor heterostructures. GaAs based optoelectronic devices (e.g. solar cells, modulators, detectors, and diodes) used space probes are subject damage arising from energetic proton (H+) irradiation. For that reason, the irradiation on coefficients is primary importance optoelectronics. However,...
Understanding the ultrafast carrier dynamics of graphene on a substrate is fundamental step in development based opto-electronic devices. Here, we present pump-probe measurements supported quartz for range pump fluences that enable us to observe both decreased and enhanced probe transmission regimes femtosecond timescale. Unexpectedly, at an intermediate fluence, order magnitude decrease relaxation time constant differential observed. By employing number different models interpret our...
Gallium phosphide is an important indirect band gap material with variety of applications in optics ranging from LEDs to GaP/Si based solar cells. We investigated GaP using ultrafast, pump-probe coherent acoustic phonon spectroscopy (time-domain Brillouin scattering). measured the dependence amplitude differential reflectivity as modulated by phonons (CAPs) a function laser probe energy and found that oscillations varies non-monotonically near direct transition at $\Gamma$ point. A...
Optical two-dimensional coherent spectroscopy (2DCS) is a powerful ultrafast spectroscopic technique that can greatly benefit from the unique features of femtosecond laser operating at kHz repetition rate. However, isolating specific nonlinear signal in collinear geometry, especially with laser, presents challenges. We present an experimental implementation optical 2DCS geometry using 5 KHz The desired selectively extracted frequency domain by lock-in detection. Both pump-probe and...
We demonstrate optical two-dimensional coherent spectroscopy in a collinear geometry on rubidium vapor with time-integrated fluorescence detection using low-repetition rate femtosecond laser for both excitation and as reference pulse shaper.