Guided-mode resonances in flexible 2D terahertz photonic crystals

• DOI: 10.1364/optica.388761
• Publication Date: 2020-04-02T13:30:09Z
• Authors: Chan Kyaw; Riad Yahiaoui; Zizwe A. Chase; Viet Tran; Andrey Baydin; Fuyang Tay; Junichiro Kono; Manukumara Manjappa; Ranjan Singh; Don C. Abeysinghe; Augustine M. Urbas; Thomas A. Searles
• Keywords: Mode (computer interface)

In terahertz (THz) photonics, there is an ongoing effort to develop thin, compact devices such as dielectric photonic crystal (PhC) slabs with desirable light–matter interactions. However, previous works in THz PhC have been limited rigid substrates thicknesses <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>∼</mml:mo> </mml:mrow> <mml:mn>100</mml:mn> <mml:mspace width="thinmathspace"/> <mml:mi mathvariant="normal">s</mml:mi> </mml:math> of micrometers. Dielectric shown possess in-plane modes that are excited by external radiation produce sharp guided-mode resonances minimal absorption for applications sensors, optics, and lasers. Here we confirm the existence guided a membrane-type slab subwavelength ( <mml:msub> <mml:mi>λ</mml:mi> <mml:mn>0</mml:mn> </mml:msub> <mml:mo>/</mml:mo> <mml:mn>6</mml:mn> <mml:mo>−</mml:mo> <mml:mn>12</mml:mn> ) flexible polyimide films. The transmittance was measured different structural parameters unit cell. Furthermore, exploited flexibility samples modulate bend angle <mml:mi>θ</mml:mi> <mml:mo>≥</mml:mo> <mml:msup> <mml:mn>5</mml:mn> <mml:mo>∘</mml:mo> </mml:msup> , confirmed experimentally suppression these modes. mechanical device allows additional degree freedom system design high-speed communications, soft wearable implantable medical devices.