title: Broadly tunable subterahertz emission from internal branches of the current-voltage characteristics of superconducting Bi2Sr2CaCu2O(8+δ) single crystals.
abstract: Continuous, coherent subterahertz radiation arises when a dc voltage is applied across a stack of the many intrinsic Josephson junctions in a Bi2Sr2CaCu2O(8+δ) single crystal. The active junctions produce an equal number of I-V characteristic branches. Each branch radiates at a slightly tunable frequency obeying the Josephson relation. The overall output is broadly tunable and nearly independent of heating effects and internal cavity frequencies. Amplification by a surrounding external cavity to allow for the development of a useful high-power source is proposed.
authors.affiliation: Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Tsujimoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Kaveh
authors.initials: K
authors.lastname: Delfanazari
authors.forename: Ryo
authors.initials: R
authors.lastname: Nakayama
authors.forename: Takeo
authors.initials: T
authors.lastname: Kitamura
authors.forename: Masashi
authors.initials: M
authors.lastname: Sawamura
authors.forename: Takanari
authors.initials: T
authors.lastname: Kashiwagi
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Minami
authors.forename: Masashi
authors.initials: M
authors.lastname: Tachiki
authors.forename: Kazuo
authors.initials: K
authors.lastname: Kadowaki
authors.forename: Richard A
authors.initials: RA
authors.lastname: Klemm