지난 번 OSA 회장께서 세미나 때 인용했던 글.



한 마디로 Rayleigh가 Fresnel lens(기본적 형태의 DOE)의 아이디어를 냈지만, 실제로 만들 수 있을 것이라고는 생각하지 않았다는 것. 못 만든다면 우리 방 졸업생 몇 명은 논문 주제를 바꿨어야 했을 것...



Lord Rayleigh (J. W. Strutt: 1842-1919)



"... To obtain such it would be necessary that the retardation should gradually alter by a wave-length in passing over any element of the grating, and then fall back to its previous value, thus springing suddenly over a wave-length. It is not likely that such a result will ever be fully attained in practice; but the case is worth stating, in order to show that there is no theoretical limit to the concentration of light of assigned wave-length in one spectrum, ..."



-- Encyclopaedia Britannica, 9th ed., vol. 24, "Wave Theory of Light" (New York, Charles Schribner's Sons, 1888), p. 437.