Design of nanofibres for efficient stimulated Raman scattering in the evanescent field

Nanofibres can be produced with diameters smaller than the wavelength of the light they guide. In this regime, the guided mode presents a strong evanescent field well adapted to the excitation of "evanescent nonlinearities". We theoretically investigate such an evanescent nonlinearity: the Raman interaction between the evanescent field and a liquid surrounding the nanofibre. Our calculations demonstrate that the Raman conversion is obtained with nanofibre lengths an order of magnitude lower than those required for liquid core photonic crystal fibres. [DOI: http://dx.doi.org/10.2971/jeos.2013.13030]