title: Efficient terahertz detection in a sheet cavity using a nonlinear optical parametric process.
abstract: We designed and simulated a GaP-based sheet cavity structure for room-temperature THz wave detection via a nonlinear optical (NLO) parametric process, using photonic conversion from THz frequencies to the optical domain. The sheet cavity structure consisted of a GaP rectangular waveguide for THz waves. Pump enhancement in the cavity and strong confinement of the THz wave in the waveguide resulted in a high power conversion efficiency of 1% (detection at 5 THz). The noise equivalent power for THz wave detection using an optical single-photon detector was estimated to be in the order of a few fW Hz(-1/2), which was higher than that obtained using room-temperature bolometers, field-effect transistors, and other NLO processes.
authors.forename: Kyosuke
authors.initials: K
authors.lastname: Saito
authors.forename: Tadao
authors.initials: T
authors.lastname: Tanabe
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oyama