Abstract
The large mode mismatch between free-space linearly-polarized beams and radially-polarized modes supported in coaxial waveguides leads to a very poor coupling efficiency that have hindered the widespread use of THz coaxial
waveguides. We show here a straightforward coupling mechanism that promises 100% efficiency. We exploit the THz pulse generation process from photoexcited charge density gradients to create a radially-polarized THz pulse with the profile matching the fundamental mode profile of the coaxial waveguide. Single mode propagation is demonstrated at the output of the coaxial waveguide
waveguides. We show here a straightforward coupling mechanism that promises 100% efficiency. We exploit the THz pulse generation process from photoexcited charge density gradients to create a radially-polarized THz pulse with the profile matching the fundamental mode profile of the coaxial waveguide. Single mode propagation is demonstrated at the output of the coaxial waveguide
Original language | English |
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Title of host publication | 41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016 |
Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
Number of pages | 2 |
Volume | CFP16IMM‐ART |
ISBN (Print) | 978‐1‐4673‐8485‐8 |
DOIs | |
Publication status | Published - Oct 2016 |
Keywords
- Terahertz
- Photocurrent
- Semiconductor
- coaxial transmission lines
- Near-field time-domain microscopy