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Antilaser: resonance absorption mode or coherent perfect absorption?a Ioffe Institute, ul. Polytekhnicheskaya 26, St. Petersburg, 194021, Russian Federation b S I Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 199034, Russian Federation c ITMO University, Kronverksky Pr. 49, bldg. A, St. Petersburg, 197101, Russian Federation It is shown that the main idea of the recent study of "coherent perfect absorption" coincides with that published in 1962 by A.P. Khapalyuk. Generalization of this approach to the case of layered systems with alternating absorbing and amplifying media needs a more thorough analysis of possible instabilities.
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