Variable Terahertz Attenuator Integrated on Nonradiative Guide Using Photoinduced Carriers

Keisuke Sasao, Yasuaki Monnai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A terahertz variable attenuator integrated on a nonradiative guide controlled by externally induced photoconductivity is proposed. Our device is constructed using high-resistivity silicon as a dielectric channel of the waveguide sandwiched between parallel conducting plates. By irradiating an excitation light to the side surface of the channel, photoinduced carriers are generated involving attenuation for terahertz waves propagating through the channel. We experimentally demonstrate attenuation of 0.50 dB/cm/mW at 300 GHz. The use of the nonradiative guide simplifies the light irradiation scheme and contributes to integrate other functions such as bending, filtering, splitting, and combining without radiation losses. We also discuss its unique frequency dependence, in which the attenuation increases as the frequency decreases.

Original languageEnglish
Article number9023006
Pages (from-to)256-259
Number of pages4
JournalIEEE Transactions on Terahertz Science and Technology
Issue number3
Publication statusPublished - 2020 May 1


  • Nonradiative (NRD) guide
  • photoinduced carriers
  • variable attenuator

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering


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