Published in
American Physical Society, Physical Review Letters, 17(96)
DOI: 10.1103/physrevlett.96.173904
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Antenna model for wire lasers
,
J. N. Hovenier,
T. O. Klaassen,
I. Kasalynas,
A. J. L. Adam,
J. R. Gao,
T. M. Klapwijk,
B. S. Williams ,
S. Kumar,
Q. Hu,
J. L. Reno
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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.