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Abstract
An infrared (IR) pyroelectric detector was investigated for terahertz (THz) detection using the principle of the terajet effect, which focuses the beam beyond the diffraction limit. The terahertz beam was coupled to the detector’s optical window through a two-wavelength-dimension dielectric cubic particle-lens based on the terajet effect. We experimentally demonstrate an enhancement of about 6 dB in the sensitivity under excitation of 0.2 THz without degradation of the noise equivalent power value. The results show that the proposed method could be applied to increase the sensitivity of various commercial IR sensors for THz applications that do not require modification of the internal structure, and it may apply also to acoustics and plasmonic detectors.
Highlights
Various types of special THz pyroelectric detector (PD) were developed in the last decade: a PD based on lithium tantalate crystal and film was considered in [20], a tetraaminediphenyl-based PD
A PD consists of a pyroelectric polyvinylidene fluoride (PVDF) film coated with a metal oxide layers
Commercial IR-PD performance was investigated in the THz range using the terajet effect
Summary
Terahertz (THz) waves have recently received unprecedented interest in product quality control, medicine, biology, 5G and 6G communication, nondestructive testing, and homeland security applications, to name a few [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17], that cannot be achieved at optical or infrared (IR) electromagnetic bands. It has been shown that to decrease the noise equivalent power value (NEP), the thickness of pyroelectric film should be reduced. All these and other similar developments require either the development of a new detector design or replacement of the material in the existing commercial detector. PDs are one of the most used devices in uncooled IR detectors, providing a high efficiency of detection of the illuminated radiation, relative short response time, high signal-to-noise ratio, low cost, and high reliability [24,25,26,27]
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