Surface-relief holograms diffraction efficiency

For Russian citation (Opticheskii Zhurnal):

Смык А.Ф., Шурыгин А.В. Дифракционная эффективность рельефно-фазовых голограмм // Оптический журнал. 2026. Т. 93. № 5. С. 24–31. http://doi.org/ 10.17586/1023-5086-2026-93-05-24-31

Smyk A.F., Shurygin A.V. Surface-relief holograms diffraction efficiency [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 5. P. 24–31. http://doi.org/10.17586/1023-5086-2026-93-05-24-31

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Diffraction efficiency of the surface-relief holograms. Objective. Evaluation of the influence of spatial frequency, depth and shape of the relief profile on diffraction efficiency, development of a method for achieving the highest diffraction efficiency, formulation of a criterion for determining the development time of a hologram recorded on a positive photoresist. Main
results. Numerical modeling of the diffraction efficiency of surface phase gratings was performed in the vector approximation using the finite-difference time-domain method. In contrast to the scalar theory, it was shown that for gratings with a deep profile (more than 0.3 of the incident wavelength), the diffraction efficiency’s maximum may shift to higher orders: a value of 82% was obtained in the second order for a sinusoidal grating with a depth of 425 nm. The results of theoretical modeling were confirmed experimentally on samples with profiles specific of security holograms. Practical significance. A criterion for the end of photoresist development based on the minimum of zero-order intensity is proposed. A technique for choosing the relief depth for the wavelength is justified for

Keywords:

hologram, surface relief, security features

OCIS codes: 090.0090, 050.1950, 090.5640, 330.1690, 230.4000

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