Presentation Information
[18a-WL2_301-3]Terahertz Biosensing Based on Silver tree-like fractal nano particles
〇(B)Yuma Yamaguchi1, Sota Itayama2, Kohei Kawamoto3, Nobuyuki Takeyasu3, Jin Wang2, Tosihiko Kiwa2 (1.School of Eng, Okayama Univ, 2.ISEHS, Okayama Univ, 3.ELST, Okayama Univ)
Keywords:
terahertz,metamaterial,biosensor
This study investigates the potential of silver tree-like fractal nanoparticles (AgTFs) as terahertz (THz) biosensors by evaluating their resonance response to changes in the surrounding dielectric environment. AgTFs were synthesized via a light-assisted liquid-phase reduction method and embedded into a polymethyl methacrylate (PMMA) film. Tallow, a triglyceride mixture containing oleic acid, was immobilized on the film surface to modify the local dielectric constant around the AgTFs.Terahertz time-domain spectroscopy (THz-TDS) was employed to measure the transmission spectra before and after tallow immobilization. A clear resonance peak shift from 1.0 THz to 0.82 THz was observed after tallow deposition. This frequency shift is attributed to an increase in the effective dielectric constant surrounding the AgTFs, resulting from the replacement of air with tallow at the film surface.These results demonstrate that the THz resonance of AgTFs is highly sensitive to changes in the local dielectric environment. Owing to their broadband resonant properties, chemical scalability, and compatibility with large-area fabrication, AgTFs show promise as a low-cost and versatile platform for THz biosensing applications.