Sharp Plasmon-Mediated Resonant Reflection From an Undulated Metal Layer Sharp Plasmon-Mediated Resonant Reflection From an Undulated Metal Layer

International audienceIEEE. Translations and content mining are permitted for academic research only. Personal use is also permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. Abstract: A close-to-the-theoretically-largest TM resonant reflection of a free-space wave from a free-standing undulated gold layer immersed in a liquid host medium is demonstrated experimentally. It is mediated by the grating-excited long-range plasmon mode propagating along the continuous metal film with particularly low loss

Transverse-mode selective resonant grating-mirrors for high power and high brightness emission

International audienceThe finite angular spectral width of a 2D resonant grating mirror is adjusted to select the fundamental transverse mode of a laser and to filter out higher order modes. The selection principle is explained phenomenologically on a simplified 1D model. The 2D design is made so as to sustain the large field concentration in the grating slab-waveguide mirror, and the technology permitting to obtain the resonant reflection within the gain bandwidth of two types of laser is described. The blank experimental measurements by means of a white light supercontinuum are shown to match the targeted specifications on the resonance spectral position and angular width

Semi-phenomenological effective permittivity approach to metallic periodic structures

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Réseaux résonnants pour la compression d'impulsions laser femtosecondes

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Monolithic dual-grating phase mask for long grating writing

International audienceA new type of achromatic phase mask is presented which creates an interferogram of single spatial frequency regardless of the ratio between the interferogram period and the exposure wavelength. The functional demonstration of this monolithic phase mask was made in the case of a long grating of period as large as 2 µm by mean of an exposure beam at 442 nm wavelength, i.e., more than four times smaller. The monolithic element performs one first splitting function exerted by a central transmission grating of period 1 which diffracts the incoming beam in two diffracted beams in the substrate which are then reflected to the backside of the substrate. The element performs a second diffractive function by means of two identical side-grating of period 2 placed at either side of the first grating. This function is the redirection of the two said beams under the monolith substrate at an angle which creates an interferogram of the desired perio

Monolithic double-grating phase mask for high-spatial-coherence large-period grating printing

International audienceA monolithic double-grating phase mask comprising three short-pitch grating sections of spatial frequencies k1 and k2 collocated at one side of a substrate produces a large-period interferogram without higher harmonics to print in a photoresist film a latent grating of small spatial frequency equal to twice k2−k1. When incorporated in a write-on-the-fly scheme, the elements permit the fabrication of unlimitedly long gratings

Spectral phase induced by the reflection on a mirror-based waveguide grating in the neighbourhood of modal resonance

International audienceA linearly polarized plane wave impinging on a mirror-based waveguide grating is shown to experience a 2 pi phase shift of controllable slope in the reflection spectrum. Such a zeroth-order resonant grating effect is adequately confirmed by means of an ellipsometer. The close agreement between the analytical representation of grating coupled waveguide resonances with the experimental results confirms the relevance of the underlying phenomenological understanding of resonant gratings

MODIFIED REFRACTIVE INDEX OF ZINC SULFIDE NANOPARTICLES DOPED GLASSES

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High-efficiency wide-band metal-dielectric resonant grating for 20 fs pulse compression

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