THz emission characteristics from mesa arrays of Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+</sub><sub>δ</sub> single crystals

ORAL

Abstract

To develop the high power terahertz emission from Bi2Sr2CaCu2O8+δ (Bi2212) high-Tc superconducting THz emitters (Bi2212-THz emitters), it is very important to manage self- heating of these devices. We have developed stand-alone mesa structures (SAMs) of Bi2212 single crystals sandwiched by good thermal conducting sapphire substrates to reduce self-heating effects. These thermal managed devices enable us to extend the range of the radiation frequencies up to around 2.4 THz. For applications of THz emitters, 1 mW level of output power and 1 kHz level of radiation linewidth are required. In order to obtain such high performance characteristics from our Bi2212-THz emitters, we have studied not only about thicker SAMs but also arrays of SAMs. The SAMs up to around 8 μm thickness with keeping good shape of mesa structures can be obtained by a wet etching method so far. We made arrays of those SAMs by using the thermal managed device structures. At this moment, we observed about 10 μW level of output power from two arrays of SAMs with the dimensions of 69 × 190 × 4.2~4.4 μm3. The details of the current situation of our Bi2212-THz emitters will be discussed.

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Presenters

  • Takanari Kashiwagi

    • Division of Materials Science, University of Tsukuba
    • Univ of Tsukuba
    • University of Tsukuba

Authors

  • Takanari Kashiwagi

    • Division of Materials Science, University of Tsukuba
    • Univ of Tsukuba
    • University of Tsukuba

  • Takayuki Imai

    • University of Tsukuba

  • Syungo Nakagawa

    • Univ of Tsukuba
    • University of Tsukuba

  • Genki Kuwano

    • University of Tsukuba

  • Yukino Ono

    • University of Tsukuba

  • Tomoyuki Shizu

    • Univ of Tsukuba
    • University of Tsukuba

  • Youta Kaneko

    • University of Tsukuba

  • Shinji Kusunose

    • University of Tsukuba

  • Mayu Nakayama

    • Univ of Tsukuba
    • University of Tsukuba

  • Jeonghyuk Kim

    • Division of Materials Science, University of Tsukuba
    • Univ of Tsukuba
    • University of Tsukuba

  • Manabu Tsujimoto

    • Univ of Tsukuba
    • University of Tsukuba

  • Takashi Yamamoto

    • QuTech Delft University of Technology

  • Hidetoshi Minami

    • University of Tsukuba

  • Takashi Mochiku

    • National Institute for Materials Science

  • Hironori Nakao

    • Institute of Materials Structure Science, High Energy Accelerator Research Organization
    • Institute of Materials Structure Science, High Energy Accelerator Research Organization, KEK
    • KEK

  • Hiroshi Eisaki

    • AIST, Japan
    • National Institute of Advanced Industrial Science and Technology
    • The National Institute of Advanced Industrial Science and Technology
    • National Institute of Advanced Industrial Science and Technology, Japan

  • Shigeyuki Ishida

    • National Institute of Advanced Industrial Science and Technology
    • The National Institute of Advanced Industrial Science and Technology

  • Yasunori Mawatari

    • National Institute of Advanced Industrial Science and Technology

  • Yukio Hasegawa

    • The university of Tokyo
    • The University of Tokyo
    • Institute for Solid State Physics, The University of Tokyo
    • Univ of Tokyo-Kashiwanoha

  • Richard Klemm

    • Univ of Central Florida
    • University of Central Florida
    • Physics, Univ of Central Florida

  • Kazuo Kadowaki

    • Univ of Tsukuba
    • University of Tsukuba