Abstract
This paper presents a critical review of piezomodulation spectroscopy (that is, optical experiments which involve an ac stress) with the intent of examining its potential for future use. A brief account of the theory of strain effects in the linear response region, including important symmetry considerations, is presented, and several examples are given to illustrate these points. The advantages and shortcomings of the various types of ac stress apparatus are discussed as a guide to prospective experimenters. The unique feature of piezomodulation spectroscopy is that it can be used for studies in which the strain induces a linear response in the dielectric function. The author feels that this linear response region is the most promising area for future piezomodulation studies.
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