The intrinsic linewidth and angular dispersion of Surface Plasmon Polariton resonance of a micrometric metal mesh have been measured with a collimated mid-infrared beam, provided by an External Cavity tunable Quantum Cascade Laser. We show that the use of a collimated beam yields an observed resonance linewidth gamma = 12 cm(-1) at the resonance frequency nu(0) = 1658 cm-1, better by an order of magnitude than with a non-collimated beam. The extremely narrow plasmon resonance attained by our mesh is then exploited to reconstruct, by varying the QCL angle of incidence theta, the angular intensity distribution f(theta) of a globar at the focal plane of a conventional imaging setup. We thus show that f (theta) is better reproduced by a Gaussian distribution than by a uniform one, in agreement with ray-tracing simulation. (C) 2013 Optical Society of America
Intrinsic linewidth of the plasmonic resonance in a micrometric metal mesh / Baldassarre, Leonetta; Ortolani, Michele; Nucara, Alessandro; Maselli, Paola; A., Di Gaspare; Giliberti, Valeria; Calvani, Paolo. - In: OPTICS EXPRESS. - ISSN 1094-4087. - STAMPA. - 21:13(2013), pp. 15401-15408. [10.1364/oe.21.015401]
Intrinsic linewidth of the plasmonic resonance in a micrometric metal mesh
BALDASSARRE, Leonetta;ORTOLANI, MICHELE;NUCARA, Alessandro;MASELLI, Paola;GILIBERTI, VALERIA;CALVANI, Paolo
2013
Abstract
The intrinsic linewidth and angular dispersion of Surface Plasmon Polariton resonance of a micrometric metal mesh have been measured with a collimated mid-infrared beam, provided by an External Cavity tunable Quantum Cascade Laser. We show that the use of a collimated beam yields an observed resonance linewidth gamma = 12 cm(-1) at the resonance frequency nu(0) = 1658 cm-1, better by an order of magnitude than with a non-collimated beam. The extremely narrow plasmon resonance attained by our mesh is then exploited to reconstruct, by varying the QCL angle of incidence theta, the angular intensity distribution f(theta) of a globar at the focal plane of a conventional imaging setup. We thus show that f (theta) is better reproduced by a Gaussian distribution than by a uniform one, in agreement with ray-tracing simulation. (C) 2013 Optical Society of AmericaI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.