All-Dielectric Guided-Mode Resonance: Utilizing 3-D Printing for Amplifying High-Q Resonance

We propose practical methods to simply and cost-effectively maximize the performance of guided-mode resonance (GMR) structures operating in the terahertz range. GMR structures with high quality factors (Q-factors) are intended to achieve enhanced signal detection capabilities at specific frequencies owing to the narrow bandwidths. Moreover, all-dielectric GMR structures provide high transmittance owing to their low loss and maximize their interaction with terahertz waves through diffraction and guided-mode effects. Among various printing techniques, we use fused deposition modeling (FDM) because of its durable products and low manufacturing costs. The obtained transmittance characteristics of GMR were compared based on the refractive indices and absorption coefficients of 3-D printing filaments, such as cyclic olefin copolymer (COC), acrylonitrile-butadiene–styrene (ABS), thermoplastic polyurethane (TPU), and poly lactic acid plus (PLA+). In addition, the impact of structural printing errors was analyzed. By modifying an ideal quasi-bound state in the continuum (BIC) and based on the optical properties of printable 3-D materials, we designed a realistically measurable dual-ridge GMR structure with a very narrow bandwidth. The proposed high Q-factor GMR structure was layered to form a complex dual-ridge GMR structure. Experimentally, a very high Q-factor of 126.22 was measured, effectively maximizing the performance of the GMR structure.