Fe. Vermeulen et al., INFRARED SURFACE-WAVES IN CIRCULAR HOLLOW WAVE-GUIDES WITH SMALL COREDIAMETERS, IEEE transactions on microwave theory and techniques, 42(10), 1994, pp. 1932-1938
An asymptotic form of the characteristic equation that describes wave
propagation at near-infrared wavelengths in small core hollow circular
waveguides is developed. Analytic solutions for the transverse and ax
ial propagation constants are obtained. These demonstrate the transiti
on of the TE(11) and TM(01) modes to surface waves as the guide radius
is increased to values much greater than at cutoff. Relative power de
nsity distributions illustrating these mode transitions are shown.