Naslov
Nonparaxial scalar treatment of sinusoidal phase gratings

Autori
Harvey, JE ; Krywonos, A ; Bogunović, Dijana

Izvornik
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A (1084-7529) 23 (2006), 4; 858-865

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
DIFFRACTION THEORY; FUNDAMENTAL QUANTITY; ANOMALIES; RADIANCE; LIMITS

Sažetak
Scalar diffraction theory is frequently considered inadequate for predicting diffraction efficiencies for grating applications where lambda/d > 0.1. It has also been stated that scalar theory imposes energy upon the evanescent diffracted orders. These notions, as well as several other common misconceptions, are driven more by an unnecessary paraxial approximation in the traditional Fourier treatment of scalar diffraction theory than by the scalar limitation. By scaling the spatial variables by the wavelength, we have previously shown that diffracted radiance is shift invariant in direction cosine space. Thus simple Fourier techniques can now be used to predict a variety of wide-angle (nonparaxial) diffraction grating effects. These include (1) the redistribution of energy from the evanescent orders to the propagating ones, (2) the angular broadening (and apparent shifting) of wide-angle diffracted orders, and (3) nonparaxial diffraction efficiencies predicted with an accuracy usually thought to require rigorous electromagnetic theory.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA