Reciprocal polarization imaging of optical activity in reflection

Area of Science:

• Optics and Photonics
• Biomedical Optics
• Chiroptical Sensing

Background:

• Optical activity is a key property of chiral molecules, crucial for pharmaceutical and biological applications.
• Measuring optical activity in reflection geometry is challenging due to complex scattering effects.
• Existing methods like Lu-Chipman decomposition struggle with backscattering Mueller matrices.

Purpose of the Study:

• To introduce a novel reciprocal polarization imaging technique for measuring optical activity in reflection.
• To demonstrate the accuracy and sensitivity of this method for chiral media.
• To explore its potential for non-invasive in vivo glucose monitoring.

Main Methods:

• Utilizing reciprocal polar decomposition of backscattering Mueller matrices.
• Incorporating anisotropic depolarization for enhanced sensitivity.
• Conducting experiments with glucose solutions in reflection geometry.

Main Results:

• Reciprocal polarization imaging accurately retrieves optical activity, unlike Lu-Chipman decomposition.
• Recovered optical rotation shows linear correlation with glucose concentration and sample thickness.
• Results align with measurements in forward scattering geometry.

Conclusions:

• Reciprocal polarization imaging offers a robust method for quantifying optical activity in reflection.
• The technique demonstrates high sensitivity and accuracy for chiral media like glucose.
• This advancement holds promise for developing non-invasive optical sensors for biological analytes.