Enhancement of THz generation in LiNbO<sub>3</sub> waveguides via multi-bounce velocity matching

Blake S. Dastrup; Eric R. Sung; Frank Wulf; Clara Saraceno; Keith A. Nelson

doi:10.1038/s41377-022-01035-9

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Enhancement of THz generation in LiNbO₃ waveguides via multi-bounce velocity matching

Original Articles

- Enhancement of THz generation in LiNbO₃ waveguides via multi-bounce velocity matching
- Light: Science & Applications Vol. 11, Issue 12, Pages: 2994-3001(2022)
- Affiliations：
  
  1.Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
  2.Faculty of Electrical Engineering and Information Technology, Ruhr University Bochum, Bochum, 44801, Germany
- Author bio：
  
  Keith A. Nelson (kanelson@mit.edu)
- Funds：
- DOI：10.1038/s41377-022-01035-9
  CLC：
- Published：31 December 2022，
  
  Published Online：25 November 2022，
  
  Received：29 May 2022，
  
  Revised：24 October 2022，
  
  Accepted：08 November 2022
- Accepted：
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Dastrup, B. S. et al. Enhancement of THz generation in LiNbO₃ waveguides via multi-bounce velocity matching. Light: Science & Applications, 11, 2994-3001 (2022).
DOI：

Dastrup, B. S. et al. Enhancement of THz generation in LiNbO₃ waveguides via multi-bounce velocity matching. Light: Science & Applications, 11, 2994-3001 (2022). DOI： 10.1038/s41377-022-01035-9.

摘要

Abstract

To realize the full promise of terahertz polaritonics (waveguide-based terahertz field generation

interaction

and readout) as a viable spectroscopy platform

much stronger terahertz fields are needed to enable nonlinear and even robust linear terahertz measurements. We use a novel geometric approach in which the optical pump is totally internally reflected to increase the distance over which optical rectification occurs. Velocity matching is achieved by tuning the angle of internal reflection. By doing this

we are able to enhance terahertz spectral amplitude by over 10x compared to conventional single-pass terahertz generation. An analysis of the depletion mechanisms reveals that 3-photon absorption and divergence of the pump beam are the primary limiters of further enhancement. This level of enhancement is promising for enabling routine spectroscopic measurements in an integrated fashion and is made more encouraging by the prospect of further enhancement by using longer pump wavelengths.

关键词

Keywords

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Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching

DOI：10.1038/s41377-022-01035-9

摘要

Abstract

关键词

Keywords

references

Enhancement of THz generation in LiNbO₃ waveguides via multi-bounce velocity matching