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Photonic nanostructure for the amplification and targeting of light radiation

diffractive dielectricfluorescencemultilayer nanostructurephotonic crystalssurface waves

Introduction

The proposed invention consists of a photonic structure, made of transparent dielectric materials, adapted to control the emission of radiation – such as fluorescence – by emitters that are located on its surface. These characteristics result into an increased efficiency in addition to an enhanced targeting of the light emitted, which is conveyed towards preferred directions rather than being distributed isotropically.

Technical features

The nanostructure consists of a one-dimensional photonic crystal or a plurality of overlapped thin layers, made of partially transparent dielectric material with a thickness variable between tens and hundreds of nanometers. The surface of the proposed device constitutes the interface to the external environment and has a periodic geometry that is compatible with the working wavelength. In a possible configuration, the diffractive granting is composed by a plurality of concentric and coaxial rings. The physical effect behind its operation provides for a transfer of energy from the emitters to the surface modes that are resonant within a specific range of excitation. Furthermore, such innovative characteristics allow to overcome the traditional limitations inherent to the technologies that are currently available on the market and therefore result into an increased efficiency in addition to an enhanced targeting of the light emitted, which is conveyed towards preferred orientations rather than being distributed isotropically.

Possible Applications

  • ampliation of light radiation;
  • redirecting light radiation;
  • sensors;
  • biomedical;
  • illumination through emitting diodes.

Advantages

  • performance increase for the amplification of the light signal;
  • better emission angular control.