title: Photonic-crystal diplexers for terahertz-wave applications.
abstract: A compact diplexer is designed using a silicon photonic-crystal directional coupler of length comparable to the incident wavelength. The diplexer theoretically and experimentally exhibits a cross state bandwidth as broad as 2% of the operation frequency, with over 40-dB isolation between the cross and bar ports. We also demonstrate 1.5-Gbit/s frequency-division communication in the 0.32- and 0.33-THz bands using a single-wavelength-sized diplexer, and discuss the transmission bandwidth. Our study demonstrates the potential for application of photonic crystals as terahertz-wave integration platforms.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yata
authors.forename: Masayuki
authors.initials: M
authors.lastname: Fujita
authors.forename: Tadao
authors.initials: T
authors.lastname: Nagatsuma