摘要:
The present invention relates to the field of photonic and optoelectronic components and more particularly relates to an optical filter (14) comprising: a plurality of semiconductor nano-/microparticles (1) arranged on a plane (22), said particles having electromagnetic resonance properties in the near-infrared and optical domain, this filter being characterised in that it furthermore comprises: a layer having an electrically adjustable refractive index (5), said layer being placed on the surface formed by said nano-/microparticles (1) and said plane (22); a first electrically insulating layer (8) that is placed on said layer having an electrically adjustable refractive index (5); and an electrode (7) placed on said first electrically insulating layer.
摘要:
The present invention relates to an optical reflective diffraction device (100) which has a high diffraction efficiency and a high resistance to laser flux, and which can be easily produced. The device is characterized in that it includes a protective structure (140) including at least one mixture layer (141) prepared by uniformly mixing a first material and a second material, both of which are dielectric, said first material having an optical index that is lower than that of the second material.
摘要:
The invention relates to a method for obtaining a reflective diffraction grating for light beam diffraction, said method including a stack of at least four planar dielectric material layers, an upper dielectric material layer being etched so as to form a diffraction grating, the etching period of which is predetermined, said method implementing the following steps: selecting the number and the nature of the dielectric material layers, including the etched layer; digitally computing the reflection and/or transmission efficiencies of at least one of the orders of diffraction for a sample of frequencies belonging to the spectral range of use for each predetermined diffraction grating configuration while varying the thicknesses of at least four of the dielectric material layers and at least one of the etching parameters of the grating; and selecting, from among the computed configurations, at least one configuration on the basis of a criterion depending on the provided use of the grating.
摘要:
The invention relates to a dispersive optical device with a three-dimensional photonic crystal. The purpose of the invention is to provide a device having as a whole a high damage threshold and that is easy to manufacture while maintaining optimal optical properties. This goal is achieved by using a silica device including a three-dimensional photonic crystal and a diffraction array. The device can particularly be used in a compressor system of a short-pulse laser.