Université de Neuchâtel

Observation of amplitude and phase in ridge and photonic crystal waveguides operating at 1.55 μm by use of heterodyne scanning near-field optical microscopy

Tortora, Pierpasquale ; Abashin, M. ; Märki, Iwan ; Nakagawa, Wataru ; Vaccaro, Luciana ; Salt, Martin Guy ; Herzig, Hans-Peter ; Levy, U. ; Fainman, Y.

In: Optics Letters, 2005, vol. 30, no. 21, p. 2885-2887

We apply heterodyne scanning near-field optical microscopy (SNOM) to observe with subwavelength resolution the amplitude and phase of optical fields propagating in several microfabricated waveguide devices operating around the 1.55 μm wavelength. Good agreement between the SNOM measurements and predicted optical mode propagation characteristics in standard ridge waveguides demonstrates the...

Université de Neuchâtel

Optical properties of microfabricated fully-metal-coated near-field probes in collection mode

Descrovi, Emiliano ; Vaccaro, Luciana ; Aeschimann, Laure ; Nakagawa, Wataru ; Staufer, Urs ; Herzig, Hans-Peter

In: Journal of the Optical Society of America A, 2005, vol. 22, no. 7, p. 1432-1441

A study of the optical properties of microfabricated, fully-metal-coated quartz probes collecting longitudinal and transverse optical fields is presented. The measurements are performed by raster scanning the focal plane of an objective, focusing azimuthally and radially polarized beams by use of two metal-coated quartz probes with different metal coatings. A quantitative estimation of the...

Université de Neuchâtel

A virtual optical probe based on localized Surface Plasmon Polaritons

Descrovi, Emiliano ; Paeder, Vincent ; Vaccaro, Luciana ; Herzig, Hans-Peter

In: Optics Express, 2005, vol. 13, no. 18, p. 7017-7027

A confined, evanescent nano-source based on the excitation of Surface Plasmon Polaritons (SPP) on structured thin metal films is proposed. With the help of a suitable cavity, we numerically demonstrate that it is possible to trap SPP over a spatial region smaller than the diffraction limit. In particular, the enhanced plasmonic field associated with the zero-order cavity mode can be used as a...