[15a-A305-1~12] 3.15 Optics and Photonics English Session

▲ [15a-A305-11] Molecular identification based on terahertz surface field depletion of terahertz plasmonic metamaterials

〇Borwen You¹, Chih-Feng Huang², Yen-Shan Lin¹, Pin-Jung Lu¹, Chien-Chung Shih³ (1.Changhua Univ., 2.Chung Hsing Univ., 3.Yunlin Univ.)

Keywords:Terahertz Optics, Terahertz sensing, Plasmonic metamaterial

In this presentation, the terahertz (THz) plasmonic metamaterial is considered from a metal-wire-woven hole array (MWW-HA). MWW-HA is not a planar MHA that is perforated on one metal slab. MWW-HA does not have extraordinary transmission of THz surface resonance waves, but the corresponding highest transmittance of metal-hole guidance approaches 0.94. However, the spectral peak splits due to middle-woven-metal wire of MWW-HA unit cell structure. The two spectral peaks are denoted by arrows and separated by one spectral dip. Power of the spectral-dip wave is confined by the middle-woven-metal wire of MWW-HA and strongly depletes without reflection. We apply this surface wave for molecular identification between polyimide (PI) and polyamic acid (PAA). PI and PAA have intrinsic difference of molecular polarity and water content, and thus surface field depletion of MWW-HA succeeds the molecular identification.