Presentation Information
[10p-N203-2]Terahertz-Wave Detection by Omnidirectional Phonon-Polariton Coupling and Amplification
〇(D)Yuto Yoneda1,2, Yuma Takida2, Joselito E. Muldera2, Alexander De Los Reyes2, Yuehong Xu2, Kunio Ishida3, Hiroaki Minamide1,2 (1.Chiba Univ., 2.RIKEN, 3.Utsunomiya Univ.)
Keywords:
THz-wave detection,Phonon polariton,Backward optical parametric oscillation
We present a novel method for detecting terahertz (THz) waves via omnidirectional phonon-polariton coupling and amplification using backward terahertz-wave parametric oscillation (BW-TPO). Unlike conventional nonlinear detection methods that rely on strict phase matching, our approach enables flexible detection geometry by exploiting dipole responses induced by phonon-polaritons. When THz waves excite phonon modes in a nonlinear crystal, omnidirectional dipole oscillations are generated in the plane orthogonal to the pump polarization. These dipole modulations enable up-conversion and amplification along the phase-matched direction. Experiments using a slanted-stripe PPLN crystal under quasi-collinear phase matching confirm robust detection from multiple THz incidence angles. This mechanism allows directional-free THz-wave detection and offers a promising platform for compact, low-noise THz System on a Chip (T-SoC) technologies applicable to remote sensing, environmental monitoring, and space debris detection.