Photochemical Strategies to Extend the Lithographic Boundaries

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Two decades ago we pioneered the study of sequential two-photon processes, described as the photochemistry of reaction intermediates. We reviewed the topic in 1988. At the time we frequently talked about two-laser two-color photochemistry, since the laser used to make an intermediate was usually of a different wavelength than that used to irradiate it, frequently leading to products that could not be obtained with a single laser or with a lamp. We usually regarded the -sometimes unavoidable- occurrence of multiphoton processes taking place within a single high-energy laser pulse as a problem.