Zobraziť v EDS

Subwavelength triangular random gratings.

Uložené v:
Podrobná bibliografia
Názov: Subwavelength triangular random gratings.
Autori: Ichikawa, Hiroyuki
Zdroj: Journal of Modern Optics. 9/15/2002, Vol. 49 Issue 11, p1893-1906. 14p.
Predmety: DIFFRACTION gratings, OPTICAL diffraction
Abstrakt: A subwavelength triangular diffractive element, whose local periods are not regular as an ordinary grating but has random values within a certain range, is proposed as a substitute for a common subwavelength antireflection grating. Its diffraction properties are electromagnetically analysed by the finite-difference time-domain method. Such a random grating shows some interesting properties, including suppression of higher diffraction orders. This improves the signal-to-noise ratio of a signal wave. Also, it is found possible for a random grating to retain a diffraction efficiency comparable with that of a regular grating, even when some local periods violate the subwavelength condition, provided that the random local period range is properly chosen. This is another advantage of a random grating over the regular grating in the fabrication process, because upper limitation on feature sizes is partially relieved. In addition, application to general random scattering problems is discussed. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Databáza: Business Source Index
Popis
Abstrakt:A subwavelength triangular diffractive element, whose local periods are not regular as an ordinary grating but has random values within a certain range, is proposed as a substitute for a common subwavelength antireflection grating. Its diffraction properties are electromagnetically analysed by the finite-difference time-domain method. Such a random grating shows some interesting properties, including suppression of higher diffraction orders. This improves the signal-to-noise ratio of a signal wave. Also, it is found possible for a random grating to retain a diffraction efficiency comparable with that of a regular grating, even when some local periods violate the subwavelength condition, provided that the random local period range is properly chosen. This is another advantage of a random grating over the regular grating in the fabrication process, because upper limitation on feature sizes is partially relieved. In addition, application to general random scattering problems is discussed. [ABSTRACT FROM AUTHOR]
ISSN:09500340
DOI:10.1080/09500340210140560