Broadband and gap-free response of a terahertz system based on a poled polymer emitter-sensor pair

Abstract

We present a terahertz (THz) system based on a poled electro-optic (EO) polymer emitter-sensor pair for the generation and detection of broadband electromagnetic pulses free of spectral gaps. The gap-free THz spectrum obtained from the system is attributed to the amorphous form of the EO polymer films. Using ∼50-fs laser pulses centered at ∼800nm, a ∼100-μm thick emitter, and a ∼180-μm thick sensor, the observable bandwidth is ∼12THz. We also present an experimental study, in a systematic manner, on the effect of phase mismatch in the polymer emitter-sensor pair.