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Continuous refractive index dispersion measurement based on derivative total reflection method.

Zhichao Deng¹, Jin Wang¹, Qing Ye¹

¹The Key Laboratory of Weak-Light Nonlinear Photonics, MOE, School of Physics and TEDA Applied Physics School, Nankai University, Tianjin 300071, China.

The Review of Scientific Instruments

|May 3, 2015

Summary

A new method, continuous refractive index dispersion measurement based on the derivative total reflection method (CRIDM-DTRM), accurately measures refractive index dispersion in scattering materials. This breakthrough enables CRID measurement for materials like biotissues.

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Area of Science:

Optics and Photonics
Materials Science
Biophysics

Background:

Continuous refractive index dispersion (CRID) measurement is challenging for scattering materials.
Existing methods often fail to accurately characterize materials exhibiting both absorption and scattering properties.

Purpose of the Study:

To propose and validate a novel CRID measurement technique applicable to both absorbing and scattering materials.
To demonstrate the capability of measuring CRID for scattering media, a previously unmet challenge.

Main Methods:

Development of the CRID measurement based on the derivative total reflection method (CRIDM-DTRM).
Experimental validation using K9 glass, concentrated milk, and methyl red solution across the 400-750 nm wavelength range.
Achieved a spectral resolution of approximately 0.259 nm.

Main Results:

Successfully measured the CRID for K9 glass, concentrated milk, and methyl red solution.
Demonstrated the first-ever measurement of CRID for a scattering material (concentrated milk).
The CRIDM-DTRM technique proved effective across the visible spectrum.

Conclusions:

The CRIDM-DTRM is a significant advancement for refractive index dispersion measurements.
This technique is particularly valuable for characterizing complex materials like biotissues and those with anomalous dispersion.
Opens new avenues for research and application in optical metrology and material characterization.