Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching
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 geometr...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Publishing Group
2022-11-01
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| Series: | Light: Science & Applications |
| Online Access: | https://doi.org/10.1038/s41377-022-01035-9 |
| _version_ | 1811210827855822848 |
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| author | Blake S. Dastrup Eric R. Sung Frank Wulf Clara Saraceno Keith A. Nelson |
| author_facet | Blake S. Dastrup Eric R. Sung Frank Wulf Clara Saraceno Keith A. Nelson |
| author_sort | Blake S. Dastrup |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T05:01:35Z |
| format | Article |
| id | doaj.art-a2b0a84377874da4afb29cac014cd161 |
| institution | Directory Open Access Journal |
| issn | 2047-7538 |
| language | English |
| last_indexed | 2024-04-12T05:01:35Z |
| publishDate | 2022-11-01 |
| publisher | Nature Publishing Group |
| record_format | Article |
| series | Light: Science & Applications |
| spelling | doaj.art-a2b0a84377874da4afb29cac014cd1612022-12-22T03:46:58ZengNature Publishing GroupLight: Science & Applications2047-75382022-11-011111810.1038/s41377-022-01035-9Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matchingBlake S. Dastrup0Eric R. Sung1Frank Wulf2Clara Saraceno3Keith A. Nelson4Department of Chemistry, Massachusetts Institute of TechnologyDepartment of Chemistry, Massachusetts Institute of TechnologyFaculty of Electrical Engineering and Information Technology, Ruhr University BochumFaculty of Electrical Engineering and Information Technology, Ruhr University BochumDepartment of Chemistry, Massachusetts Institute of TechnologyAbstract 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.https://doi.org/10.1038/s41377-022-01035-9 |
| spellingShingle | Blake S. Dastrup Eric R. Sung Frank Wulf Clara Saraceno Keith A. Nelson Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching Light: Science & Applications |
| title | Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching |
| title_full | Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching |
| title_fullStr | Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching |
| title_full_unstemmed | Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching |
| title_short | Enhancement of THz generation in LiNbO3 waveguides via multi-bounce velocity matching |
| title_sort | enhancement of thz generation in linbo3 waveguides via multi bounce velocity matching |
| url | https://doi.org/10.1038/s41377-022-01035-9 |
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