Spatial and spectral characteristics in realizations of broadband terahertz spectroscopy on a subwavelength scale.

ABSTRACT: In this work, we take aim at the fundamental challenge for realizations of broadband terahertz (THz) spectroscopy on a subwavelength scale. We introduce apertured THz microjets in this effort to resolve the fundamental limits of spatial resolution and spectral bandwidth. The THz microjets are formed as intense foci at the rear of engineered (microcomposite) spheres and are coupled through subwavelength (circular) apertures. Such coupling enables effective transmission of THz power through samples with broad spectral bandwidths and fine spatial resolutions. We show that the apertures function as high-pass filters, with their diameter d enabling strong transmission above a cutoff frequency f_c. Our theoretical and experimental results reveal that the values for d and f_c

SUBMITTER: Guidi AN 

PROVIDER: S-EPMC10387480 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature