High precision refractometry based on Fresnel diffraction from phase plates

Optics Letters
M Taghi TavassolyKhosrow Hassani

Abstract

When a transparent plane-parallel plate is illuminated at a boundary region by a monochromatic parallel beam of light, Fresnel diffraction occurs because of the abrupt change in phase imposed by the finite change in refractive index at the plate boundary. The visibility of the diffraction fringes varies periodically with changes in incident angle. The visibility period depends on the plate thickness and the refractive indices of the plate and the surrounding medium. Plotting the phase change versus incident angle or counting the visibility repetition in an incident-angle interval provides, for a given plate thickness, the refractive index of the plate very accurately. It is shown here that the refractive index of a plate can be determined without knowing the plate thickness. Therefore, the technique can be utilized for measuring plate thickness with high precision. In addition, by installing a plate with known refractive index in a rectangular cell filled with a liquid and following the described procedures, the refractive index of the liquid is obtained. The technique is applied to measure the refractive indices of a glass slide, distilled water, and ethanol. The potential and merits of the technique are also discussed.

References

Oct 3, 2008·Optics Letters·Peter H TomlinsMatthew Tedaldi
Mar 3, 2009·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·M Taghi TavassolyAli-Reza Moradi
Jul 23, 2007·Optics Express·Sheng-Hua LuChing-Fen Kao
Oct 14, 2009·Applied Optics·Mohammad Taghi TavassolyKhosrow Hassani
Sep 15, 1982·Applied Optics·Z Karny, O Kafri
Nov 3, 2010·Optics Letters·M Taghi Tavassoly, Ahad Saber
Dec 18, 2010·Optics Express·Mohammad AmiriZahra Alirezaei

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Citations

Apr 5, 2017·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Hamid SalvdariS R Hosseini
Oct 24, 2012·Applied Optics·M Taghi TavassolyRoxana Rezvani Naraghi
Jan 16, 2019·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Ali MotazedifardA Salehpour
Sep 24, 2016·Applied Optics·Masoomeh Dashtdar, S Mohammad-Ali Hosseini-Saber
Mar 10, 2018·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Hamid Salvdari, M Taghi Tavassoly
Nov 25, 2018·Optics Express·Yinxu BianAydogan Ozcan
Apr 1, 2020·Applied Optics·Masoud Ghoorchi-Beygi, Masoomeh Dashtdar
Mar 15, 2016·Applied Optics·Khosrow HassaniMohammad Taghi Tavassoly
Jun 16, 2018·Optics Letters·Ehsan A AkhlaghiZahra Abbasi
Jan 14, 2021·Scientific Reports·Morteza J SiavashaniAli-Reza Moradi

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