Experimental determination of nanocomposite grating structures by light- and neutron-diffraction in the multi-wave-coupling regime
Autor: | Joachim Kohlbrecher, Martin Fally, Roque F. Madrigal, Jürgen Klepp, Yasuo Tomita, Jinxin Guo, Antonio Fimia |
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Rok vydání: | 2021 |
Předmět: |
Diffraction
Materials science business.industry Neutron diffraction Phase (waves) Physics::Optics 02 engineering and technology Refractive index profile Grating 021001 nanoscience & nanotechnology Diffraction efficiency 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Wavelength Optics 0103 physical sciences 0210 nano-technology business Refractive index |
Zdroj: | Optics Express. 29:16153 |
ISSN: | 1094-4087 |
Popis: | We experimentally demonstrate how to accurately retrieve the refractive index profile of photonic structures by standard diffraction experiments and use of the rigorous coupled-wave analysis in the multi-wave coupling regime, without the need for taking any auxiliary data. In particular, we show how the phases of the Fourier components of a periodic structure can be fully recovered by deliberately choosing a probe wavelength of the diffracting radiation much smaller than the lattice constant of the structure. In the course of our demonstration, we accurately determine the slight asymmetry of the structure of nanocomposite phase gratings by light and neutron diffraction measurements. |
Databáze: | OpenAIRE |
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