Design of high-efficiency ultrabroadband dielectric gratings

Zoltán Várallyay, P. Dombi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We present a design concept of dielectric gratings containing resonant high (TiO2) and resonant low (SiO2) index dielectric thin-film layers between the grating and the underlying multilayer reflector. We use numerical simulations and the genetic algorithm optimization method to achieve high diffraction efficiency (>97%) in the first diffracted order over a wide wavelength range (∼160 nm) at around 800 nm. The basic concept of the structural optimization contains a high refractive index binary grating with alternating low- and high-index reflector layers, the thicknesses of which are also among the optimization parameters. We introduce two resonant dielectric layers directly below the corrugated TiO2 grating structure and we choose a small (

Original languageEnglish
Pages (from-to)5769-5774
Number of pages6
JournalApplied Optics
Volume53
Issue number25
DOIs
Publication statusPublished - Sep 1 2014

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gratings
Diffraction efficiency
Dielectric films
Structural optimization
optimization
reflectors
Refractive index
Multilayers
Genetic algorithms
Thin films
Wavelength
Computer simulation
genetic algorithms
refractivity
thin films
diffraction
wavelengths
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Design of high-efficiency ultrabroadband dielectric gratings. / Várallyay, Zoltán; Dombi, P.

In: Applied Optics, Vol. 53, No. 25, 01.09.2014, p. 5769-5774.

Research output: Contribution to journalArticle

Várallyay, Zoltán ; Dombi, P. / Design of high-efficiency ultrabroadband dielectric gratings. In: Applied Optics. 2014 ; Vol. 53, No. 25. pp. 5769-5774.
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