Simultaneous measurement of orthogonal terahertz fields via an emission multiplexing scheme
Year: 2023
Type: article
Abstract: We propose a polarization sensitive terahertz time-domain spectrometer that can record orthogonally polarized terahertz fields simultaneously, using fibre-coupled photoconductive antennas and a scheme that modulated the emitter's polarization. The s and p channels of the multi-pixel terahertz emitter were modulated at different frequencies, thereby allowing orthogonal waveforms to be demultiplexed from the recorded signal in post-processing. The performance of the multi-pixel emitter used in this multiplexing scheme was comparable to that of a commercial single-polarization H-dipole antenna. The approach allowed two orthogonally polarized terahertz pulses to be recorded with good signal to noise (>1000:1) within half a second. We verified the capability of the spectrometer by characterizing a birefringent crystal and by imaging a polarization-sensitive metamaterial. This work has significant potential to improve the speed of terahertz polarization sensitive applications, such as ellipsometry and imaging.
Source: Optics Express
DOI: 10.1364/oe.505567
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Funders: National Science and Technology Council, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, China Scholarship Council, Guangdong Provincial Applied Science and Technology Research and Development Program, National Science and Technology Council, Engineering and Physical Sciences Research Council, Science and Technology Planning Project of Guangdong Province
OpenAlex ID: W4388638199