Generating and Enhancing THz Pulses via an Antenna-Coupled Unitraveling-Carrier Photodiode Array

Ming Che, Kazuya Kondo, Kazutoshi Kato

Research output: Contribution to journalArticlepeer-review


Terahertz (THz) pulses with picosecond-level duration are generated and enhanced by fabricating arrayed InP/InGaAs unitraveling-carrier photodiodes (UTC-PDs) with integrated planar bowtie antennas. We experimentally demonstrated THz pulses generation from an UTC-PD with a duration of 10ps and 25GHz repetition rate. Compared with those of an individual UTC-PD excited at a photocurrent of 3mA and dc bias voltage of -1.5V, the pulsed THz waves generated from three arrayed UTC-PDs exhibited a 7-dB power enhancement gain after optical time alignment through optic-fiber delay lines. Experimental results indicate that this optoelectronic THz pulses generation based on arrayed UTC-PDs can achieve scalable directional gain and low-profile assembly. Enhanced THz pulses generation will be beneficial for the applications of quasi-time-domain THz spectroscope and pulse-based THz communications.

Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalIEEE Transactions on Terahertz Science and Technology
Issue number3
Publication statusPublished - May 1 2023

All Science Journal Classification (ASJC) codes

  • Radiation
  • Electrical and Electronic Engineering


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