Temperature dependence of terahertz pulses produced by difference- frequency mixing in InSb
Terahertz radiation emitted from (111) InSb illuminated with focused 1.4 μm laser pulses is due to both difference-frequency mixing and depletion field driven current. By rotating an undoped (111) InSb sample at a temperature of 80 K about its surface normal, we were able to separate the relative co...
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| Published in: | Applied physics letters Vol. 67; no. 25; pp. 3688 - 3690 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
| Published: |
18-12-1995
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| Online Access: | Get full text |
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| Summary: | Terahertz radiation emitted from (111) InSb illuminated with focused 1.4 μm laser pulses is due to both difference-frequency mixing and depletion field driven current. By rotating an undoped (111) InSb sample at a temperature of 80 K about its surface normal, we were able to separate the relative contribution of the azimuthally dependent difference-frequency mixing (DFM) signal from the total terahertz wave form. Contrary to expectations, it was found that the azimuthally dependent spectrum appears nearly identical to the azimuthally independent spectrum. From this, it is concluded that the spectrum of the current surge signal blue shifts as the pump is focused. Also, a strong similarity exists between the temperature dependence of the DFM and current surge signals. |
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| ISSN: | 0003-6951 1077-3118 |
| DOI: | 10.1063/1.114928 |