Abstract-Enhanced spatial resolution of terahertz spectroscopy via semiconductor photoexcitation

 

Daniel Krotkov, Eli Flaxer, Sharly Fleischer, 

Experimental setup. In the EO sampling dashed rectangle, the components are a GaP crystal, a quarter waveplate, a Wollaston prism (WP) and two photodiodes (PD1 and PD2). The EO probe spatially unites with the THz via a pellicle beam splitter (PBS).

https://www.osapublishing.org/osac/fulltext.cfm?uri=osac-3-12-3365

We utilize the photoexcitation of a semiconductor material as a ‘reflectivity switch’ for a broadband terahertz field. We show that judicious use of this switch enables temporal characterization of the THz field with spatial resolution significantly surpassing the diffraction limit of the terahertz and provides desirable means for spatio-temporal terahertz spectroscopy.

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