Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors
An ongoing limitation of terahertz spectroscopy is that the technique is generally limited to the study of relatively large samples of order 4 mm across due to the generally large size of the focal beam spot. We present a nested concentric parabolic reflector design which can reduce the terahertz fo...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2015-09-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4931815 |
| _version_ | 1818290920142929920 |
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| author | V. A. Neumann N. J. Laurita LiDong Pan N. P. Armitage |
| author_facet | V. A. Neumann N. J. Laurita LiDong Pan N. P. Armitage |
| author_sort | V. A. Neumann |
| collection | DOAJ |
| description | An ongoing limitation of terahertz spectroscopy is that the technique is generally limited to the study of relatively large samples of order 4 mm across due to the generally large size of the focal beam spot. We present a nested concentric parabolic reflector design which can reduce the terahertz focal spot size. This parabolic reflector design takes advantage of the feature that reflected rays experience a relative time delay which is the same for all paths. The increase in effective optical path for reflected light is equivalent to the aperture diameter itself. We have shown that the light throughput of an aperture of 2 mm can be increased by a factor 15 as compared to a regular aperture of the same size at low frequencies. This technique can potentially be used to reduce the focal spot size in terahertz spectroscopy and enable the study of smaller samples. |
| first_indexed | 2024-12-13T02:35:50Z |
| format | Article |
| id | doaj.art-b403856fcfa34642be9098321b313cc2 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-13T02:35:50Z |
| publishDate | 2015-09-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-b403856fcfa34642be9098321b313cc22022-12-22T00:02:24ZengAIP Publishing LLCAIP Advances2158-32262015-09-0159097203097203-710.1063/1.4931815066509ADVReduction of effective terahertz focal spot size by means of nested concentric parabolic reflectorsV. A. Neumann0N. J. Laurita1LiDong Pan2N. P. Armitage3Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland, 21218, USADepartment of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland, 21218, USADepartment of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland, 21218, USADepartment of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland, 21218, USAAn ongoing limitation of terahertz spectroscopy is that the technique is generally limited to the study of relatively large samples of order 4 mm across due to the generally large size of the focal beam spot. We present a nested concentric parabolic reflector design which can reduce the terahertz focal spot size. This parabolic reflector design takes advantage of the feature that reflected rays experience a relative time delay which is the same for all paths. The increase in effective optical path for reflected light is equivalent to the aperture diameter itself. We have shown that the light throughput of an aperture of 2 mm can be increased by a factor 15 as compared to a regular aperture of the same size at low frequencies. This technique can potentially be used to reduce the focal spot size in terahertz spectroscopy and enable the study of smaller samples.http://dx.doi.org/10.1063/1.4931815 |
| spellingShingle | V. A. Neumann N. J. Laurita LiDong Pan N. P. Armitage Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors AIP Advances |
| title | Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors |
| title_full | Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors |
| title_fullStr | Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors |
| title_full_unstemmed | Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors |
| title_short | Reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors |
| title_sort | reduction of effective terahertz focal spot size by means of nested concentric parabolic reflectors |
| url | http://dx.doi.org/10.1063/1.4931815 |
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