[10p-N203-1~10] 4.6 Terahertz Photonics

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)English Presentation

[10p-N203-5] Efficient THz Absorber based on Polymer-Hexaferrite Composite Films

〇Justin LLANDRO^1,2, Zhehong LIU^2,3, Yoshito MURATA⁴, Yoshihiro OKAMURA^3,4, Yasujiro TAGUCHI^2,3, Youtarou TAKAHASHI^3,4, Yoshinori TOKURA^3,4,5, Satoshi OKAMOTO^1,2 (1.Sumitomo Chemical, 2.RIKEN BZP, 3.RIKEN CEMS, 4.Univ. Tokyo, 5.Tokyo College)

Keywords:

terahertz absorber,polymer,hexaferrite

Terahertz radiation, particularly the frequency band 0.1~1 THz, is attracting strong interest as a contact-free probe of material properties. However, its increasing use in communications also leads to high background noise in THz spectroscopy, making efficient THz absorbers vital. Usually metamaterials and polymer composites with conductive fillers are used, which can exhibit high absorption but over a relatively narrow frequency range and/or above 1 THz. Here, we present an alternative approach to high-performance wide-band THz absorbers, based on composites where both matrix (polyacrylonitrile (PAN)) and filler (multiferroic Y-type hexaferrite Ba_2-ySr_yCo_2-xFe_11+xAlO₂₂ microparticles) act as THz absorbers. Although PAN and single-crystal Y-type hexaferrite reach maximum absorption at 0.7~0.8 THz, this frequency for the composite shifts down to 0.5 THz even with only 4% vol. of the hexaferrite. Increased hexaferrite content and polymers other than PAN are currently being evaluated.