Terahertz-wave surface-emitted difference-frequency generation without quasi-phase-matching technique
A scheme of terahertz (THz)-wave surface-emitted difference-frequency generation (SEDFG), which lacks the drawbacks associated with the usage of periodically orientation-inverted structures, is proposed. It is shown that both material birefringence of the bulk LiNbO(3) crystal and modal birefringenc...
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| Published in | Optics letters Vol. 35; no. 15; p. 2508 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.08.2010
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| Online Access | Get more information |
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| Summary: | A scheme of terahertz (THz)-wave surface-emitted difference-frequency generation (SEDFG), which lacks the drawbacks associated with the usage of periodically orientation-inverted structures, is proposed. It is shown that both material birefringence of the bulk LiNbO(3) crystal and modal birefringence of GaAs/AlAs waveguide are sufficient to obtain SEDFG up to a frequency of approximately 3THz. The simplicity of the proposed scheme, along with the fact that there is a much smaller THz-wave decay in nonlinear crystal, makes it a good candidate for the practical realization of efficient THz generation. The use of a GaAs waveguide with an oxidized AlAs layer is proposed for enhanced THz-wave SEDFG in the vicinity of the GaAs polariton resonance at 8THz. |
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| ISSN: | 1539-4794 |
| DOI: | 10.1364/OL.35.002508 |