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Theses

Extraordinary optical transmission in holographic and polycrystalline diffractive nanostructures

Abstract : The thesis is devoted to the Extraordinary Optical Transmission observed in diffractive systems. An industrial need in integration and miniaturization of optical components stimulates the development of planar grating-based devices with thicknesses comparable to operating wavelengths. The EOT effect is perspective for plasmonic applications in structure-induced colors, optical filtering, lasing, optical biosensors due to the improved signal-to-noise ratio and a simplified device design. Aimed at practically available materials and industrially-compatible surface nanotexturing methods, a systematic study of EOT through continuous aluminum films was performed. A modification of laser interference lithography allowing rapid fabrication of variable depth gratings was proposed, theoretically established and experimentally validated. The variable depth defines the efficiency of plasmonic coupling at a fixed wavelength, offering additional possibilities for light manipulations. Using this approach the existence of optimal grating depth for EOT was demonstrated experimentally and depth-resolved structure-induced colors were observed in transmission. For the first time the effect of EOT was experimentally measured in polycrystalline samples, fabricated via nanosphere photolithography. A phenomenological model of EOT in polycrystaline structures and a dimensionless coefficient of disorder are proposed to explain measured transmission curves. The grating depth and disorder concurrence was studied numerically. The systematic study of EOT in various diffraction systems presented in this thesis might pave the way towards more effective plasmonic devices and industrial applications.
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  • HAL Id : tel-03207369, version 1

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Andrei Ushkov. Extraordinary optical transmission in holographic and polycrystalline diffractive nanostructures. Optics [physics.optics]. Université de Lyon, 2020. English. ⟨NNT : 2020LYSES026⟩. ⟨tel-03207369⟩

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