Design of an efficient terahertz wave source from a gap waveguide embedded in a silicon slot waveguide

K. Saito, T. Tanabe, Y. Oyama

Research output: Contribution to journalArticle

Abstract

Here, we propose an efficient scheme for terahertz (THz) wave generation on the basis of difference frequency mixing (DFM) using a GaP ridge waveguide embedded in a silicon slot waveguide. Phase matching in the DFM process, between the nonlinear polarisation wave induced by two near-infrared pumps and the generated THz wave in the low-refractive-index slot waveguide, was achieved by utilising the modal birefringence of the fundamental transverse electric- and transverse magnetic-like modes at telecom wavelengths in the GaP ridge waveguide. The effective cross-sectional area of the THz wave in the waveguide was small, 220 µm2 at 2.26 THz, resulting in a photon conversion efficiency of 5.7×10-2%. The THz output power approached the multi-µW level using the proposed waveguide structure.

Original languageEnglish
Pages (from-to)2-6
Number of pages5
JournalJournal of the European Optical Society
Volume10
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Frequency mixing
  • Nonlinear optical effect
  • Semiconductor waveguide
  • Terahertz wave

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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