Application of Fresnel diffraction to fabrication and characterization of glass phase steps

Abstract

In this paper we used Fresnel diffraction in order to study the effects of hydrofluoric acid concentration and temperature on glass etching rate. The technique is very simple and accurate, and nanoscale change of the glass thickness can be detected and measured during etching. Using measured etching rates we have fabricated several glass phase steps. The fabricated phase steps were characterized by Fresnel diffractometry and optical interferometry. Using this method one can fabricate and characterize low-cost phase shifters of appropriate accuracy in less than 1 h.

Quantitative phase imaging based on Fresnel diffraction from a phase plate

“…Thus far, Fresnel diffraction from a phase step is studied [27][28][29] and widely considered in the context of different metrological applications, e.g., the measurement of refractive indices of solids and liquids [30][31][32], thickness of films and plates [33], focal length of an imaging system [34], etching rate of glass steps [35], and determination of the off-axis angle and the wavelength of light [36].…”