Abstract
We report on the operation of a highly sensitive terahertz imaging system relying on a planar metallic plasmonic crystal as a terahertz surface plasmon resonant (THz-SPR) sensor. The terahertz imaging is based on the resonantly enhanced transmission phenomenon of a periodically perforated metal film. The detection sensitivity and the imaging contrast for small amounts of substance are considerably better than those of the conventional terahertz transmission imaging without a THz-SPR sensor. As a demonstration, a high contrast image of a fingerprint recorded on a thin film can be achieved by using this system.
Highlights
Terahertz (THz) technologies have developed remarkably in the past decade
We report on the operation of a highly sensitive terahertz imaging system relying on a planar metallic plasmonic crystal as a terahertz surface plasmon resonant (THz-SPR) sensor
We believe that this highly sensitive imaging technique has a great potential to be included in various THz applications
Summary
Terahertz (THz) technologies have developed remarkably in the past decade. Since many materials have distinguishing optical properties in the THz region, several practical. Due to the strong localization of the electric field of SPPs near the MPC surface, the resonant transmission characteristic depends strongly on the dielectric distribution in the vicinity of the MPC surface [13] This characteristic allows us to achieve a highly sensitive detection of small amounts of sample placed at a subwavelength distance from the MPC surface [14]. We demonstrate, for the first time, the highly sensitive THz imaging of samples that are very thin and only available in small amounts, by using the characteristics of the MPC surface plasmon resonance (SPR) Such a SPR sensing and/or imaging are possible in other frequency regions, such as the visible or the near-infrared, with other optical configuration [10]. In the THz region, there is a particular interest due to the rich optical properties in biologically-relevant molecules, medical agents or other materials that are closely relevant to the human life
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