Presentation Information

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[8a-E218-5]Symmetry-protected BIC at the Γ point and its symmetry-breaking-induced Fano resonance in a Babinet complementary metal mesh structure

〇(B)YASUYUKI SAKANAKA¹, SHUHEI MATSUYAMA¹, MIYUU MATSUNAGA¹, MASAHIRO UEDA¹, YOSHINORI SHOHMITSU², TAKEHIKO WADA⁴, TOYOAKI SUZUKI³, TOSHIHIRO NAKAOKA¹ (1.Sophia Univ., 2.QUP, 3.JAXA, 4.NAOJ)

Keywords:

Terahertz,Bound State in the Continuum,Band-pass filter

We investigate a bottom-plasmon (BP) mode that forms a symmetry-protected bound state in the continuum (BIC) at the Γ point in a THz-band Fabry–Pérot (FP) band-pass filter. The BP mode does not couple to radiation under normal incidence. Partial symmetry breaking couples the BP mode to free-space radiation, and the mode appears as a Fano resonance on the FP-mode background. The FP mode provides the continuum background, resulting in a Fano line shape that depends on the FP cavity length.

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