Antenna model for wire lasers |
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Authors: | Orlova E E Hovenier J N Klaassen T O Kasalynas I Adam A J L Gao J R Klapwijk T M Williams B S Kumar S Hu Q Reno J L |
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Institution: | Institute for Physics of Microstructures, Russian Academy of Sciences, Nishny Novgorod GSP-105. orlova@ipm.sci-nnov.ru |
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Abstract: | An antenna model is proposed for long (L > A) lasers with subwavelength cross sections (wire lasers). It is shown that the far-field pattern of the wire lasers is determined by the ratio of the wavelength to the length. The radiation of the wire laser is predicted to be concentrated in a narrow beam theta approximately radical(2lambda/L) for laser modes where the longitudinal phase velocity is in synchronism with the velocity of light in air. Experimental results obtained using a terahertz quantum cascade wire laser are in agreement with the model. |
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