Measurement of refractive index of solid medium by critical angle method when air gap is present

Hwan Hong Lim, Moon Soo Kwon, Hee Joo Choi, Byoung Joo Kim, Myoungsik Cha

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A critical angle method was used to measure the index of refraction of a solid medium when an air gap between the prism and the medium is present. The gap effect was analyzed both numerically and experimentally. Since the total internal reflection is severely disturbed by the large gap, determination of the critical angle and the resulting refractive index becomes ambiguous and inaccurate. By using an index matching fluid, we could determine the index of refraction with an uncertainty of ±2 × 1-3 even when the gap is as large as 1 μm.

Original languageEnglish (US)
Pages (from-to)210-214
Number of pages5
JournalJournal of the Optical Society of Korea
Volume12
Issue number3
DOIs
StatePublished - 2008
Externally publishedYes

Keywords

  • Critical angle method
  • Refractive index
  • Total internal reflection

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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