Diffraction by gratings with random fill factor

Torcal Milla, Francisco José (Universidad de Zaragoza) ; Sánchez-Brea, Luis Miguel

Resumen: In this work, we analyze the diffraction produced by Ronchi gratings where the fill factor is not constant, but presents random fluctuations around its nominal value. This effect can be produced while developing the grating with etchers since the process can be slightly unpredictable. We obtain the theoretical formalism to describe the intensity produced by the grating at near and far field, showing that smoothing of the self-images is produced at the near field and, consequently, cancellation of higher diffraction orders is obtained at the far field. In addition, different nominal fill factors produce different diffraction behaviors in terms of the randomness. We corroborate the analytical formalism using a direct integration method based on the Rayleigh-Sommerfeld formula and conclude that the numerical results are in high agreement with the theoretical predictions.

Idioma: Inglés

DOI: 10.1364/AO.56.005253

Año: 2017

Publicado en: APPLIED OPTICS 56, 18 (2017), 5253-5257
ISSN: 1559-128X

Factor impacto JCR: 1.791 (2017)

Categ. JCR: OPTICS rank: 49 / 94 = 0.521 (2017) - Q3 - T2

Factor impacto SCIMAGO: 0.715 - Electrical and Electronic Engineering (Q1) - Engineering (miscellaneous) (Q1) - Atomic and Molecular Physics, and Optics (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/RTC-2016-5277-5

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Física Aplicada (Dpto. Física Aplicada)