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Reference.org
Dual-polarization interferometry
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<p>Dual-polarization interferometry (DPI) is an analytical technique that probes molecular layers adsorbed to the surface of a <a href="/facts/Waveguide_(optics)/CQ6AnRAl">waveguide</a> using the <a href="/facts/Evanescent_wave/svCyRKr7">evanescent wave</a> of a <a href="/facts/Laser/jk6PTvvT">laser</a> beam. It is used to measure the <a href="/facts/Conformational_change/q23CgKgo">conformational change</a> in proteins, or other biomolecules, as they function (referred to as the <a href="/facts/Conformation_activity_relationship/rWjCWgnK">conformation activity relationship</a>). </p>