Alteration of optical Bragg phenomenon by substrate roughness

Ricardo A. Fiallo; Chengzhi Li; Mark W. Horn; Akhlesh Lakhtakia

doi:10.1117/12.2659702

25 April 2023 Alteration of optical Bragg phenomenon by substrate roughness

Ricardo A. Fiallo, Chengzhi Li, Mark W. Horn, Akhlesh Lakhtakia

Proceedings Volume 12490, Surface Engineering and Forensics; 1249004 (2023) https://doi.org/10.1117/12.2659702
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

A Bragg mirror is a dielectric slab that is periodically nonhomogeneous in the thickness direction. It displays the Bragg phenomenon as a high-reflectance spectral regime that depends on the direction of propagation and the polarization state of the incident light. Implicit in both theoretical treatments and fabrication procedures is the smoothness of the surface on which the Bragg mirror is fabricated. We have found that the Bragg phenomenon exhibited in the visible regime by periodically nonhomogeneous thin films grown on glass substrates can be significantly affected, even nullified, by pre-fabrication roughening of the surface of the substrate.

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Ricardo A. Fiallo, Chengzhi Li, Mark W. Horn, and Akhlesh Lakhtakia "Alteration of optical Bragg phenomenon by substrate roughness", Proc. SPIE 12490, Surface Engineering and Forensics, 1249004 (25 April 2023); https://doi.org/10.1117/12.2659702

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KEYWORDS

Glasses

Thin films

Silicon

Mirror surfaces

Contrast transfer function

Thin film deposition

Semiconducting wafers

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