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We generate terahertz radiation via two-color laser filamentation with average output power of 1.4 mW and peak fields of 4.4 MV/cm. We also introduce a real-time, uncooled, cost-effective microbolometer camera for terahertz profiling and imaging.
We observe terahertz polarization evolves from linear to elliptical with increasing plasma length. This ellipticity arises from successive polarization rotation of local THz plasma sources and the velocity mismatch between laser and terahertz pulse.
We observe enhanced supercontinuum (SC) radiation emitted from noncollinear bi-filaments produced by two crossed femtosecond laser pulses in air. The spectrum is much broader than single-filament-produced SC under the same net input energy.
We observe quasi-phase-matched, super-broadband terahertz generation from two-color, laser-produced plasma filaments. In this regime, the terahertz output increases linearly with the filament length and the far-field radiation is peaked at an off-axis angle.
Two-dimensional (2D) transverse photocurrent generation is detailed for terahertz energy and polarization control in two-color, laser-produced air filaments. A full control of terahertz output is demonstrated and in good agreement with our 2D photocurrent model.
We conducted cell viability monitoring using a portable fluorescence optical detection system in situ and various types of imaging processing analyses. Results measured by the system on a microscale cell based assay in the short-term will be presented.
We study the feasibility of a diffraction-based cell monitoring system that can be applied to sensing cell viability on an in vitro assay. The system captures angular shifts in the light profile diffracted by periodic blazed grating substrate on the cell status changes. The preliminary results simulated with a simple cell viability model are presented.
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