Variation of the reflectance of the aluminized tip of a near-field scanning optical microscope is used to measure the temperature rise due the confinement of light in the tip. The measurement technique involves a pump-probe beam approach, and uses a two-step process which eliminates the need to know the dependence of the signal on the scattering cross section of the tip.
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Kavaldjiev et al. (1995) studied this question.
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