固有ジョセフソン接合を用いたテラヘルツ波発振素子のキャビティモードの計算

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2012/09/01

タイトル(英語): Calculation of Cavity Modes in Terahertz-wave Oscillators using Intrinsic Josephson Junctions

著者名: 立木　隆（防衛大学校　電気電子工学科），内田　貴司（防衛大学校　電気電子工学科）

著者名(英語): Takashi Tachiki (Department of Electrical and Electronic Engineering, National Defense Academy), Takashi Uchida (Department of Electrical and Electronic Engineering, National Defense Academy)

キーワード: テラヘルツ波，発振素子，高温超伝導体，ジョセフソン接合，サイン・ゴードン方程式　　Terahertz-wave，oscillator，high-temperature superconductor，Josephson junction，sine-Gordon equation

要約(英語): To evaluate cavity resonance modes in terahertz-wave oscillators using intrinsic Josephson junction stacks in high-temperature superconductors, an analytical solution of the coupled sine-Gordon equation was obtained by a continuous approximation. For a rectangular stack with a realistic scale, 80μm wide, 300μm long and 1.1μm (∼700 junctions in the stack) in height, I-V characteristics and field distributions were calculated from the solution. Peak structures were appeared in the I-V curves and corresponded to cavity resonance modes, which were similar to those in a rectangular waveguide cavity. The maximum peak height was obtained at a bias voltage where the TEy111 mode at 0.51 terahertz was excited by the ac Josephson effect. The peak height decreased with increasing a radiation conductance that was introduced for including a radiation loss in the calculation. For design of antenna-coupled oscillators, a junction impedance was also evaluated. These results are useful for future improvement of the oscillators using intrinsic junctions.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.132 No.9 （2012） 特集：テラヘルツ波

本誌掲載ページ: 747-752 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/132/9/132_747/_article/-char/ja/