The even-phase diffractive optical element that produces four equi-intense diffraction orders with maximum efficiency is derived. A fullwave electromagnetic analysis is performed to study the behavior of the device in the resonance domain. Moreover, such full-wave analysis agrees with the scalar prediction in the limit of very large values of the grating period. Design curves for the transmission efficiency as a function of the grating period and of the incidence angle are presented. The effects of quantization of the phase profile to a discrete number of phase levels are considered. The optimization of a simple structure with only four phase levels is reported, showing good results in terms of diffraction efficiency and angular bandwidth. © 2002 Society of Photo-Optical Instrumentation Engineers.
Optimum even-phase four-beam multiplier / R., Borghi; Frezza, Fabrizio; Pajewski, Lara; M., Santarsiero; G., Schettini. - In: OPTICAL ENGINEERING. - ISSN 0091-3286. - 41:11(2002), pp. 2736-2742. [10.1117/1.1510536]
Optimum even-phase four-beam multiplier
FREZZA, Fabrizio;PAJEWSKI, Lara;
2002
Abstract
The even-phase diffractive optical element that produces four equi-intense diffraction orders with maximum efficiency is derived. A fullwave electromagnetic analysis is performed to study the behavior of the device in the resonance domain. Moreover, such full-wave analysis agrees with the scalar prediction in the limit of very large values of the grating period. Design curves for the transmission efficiency as a function of the grating period and of the incidence angle are presented. The effects of quantization of the phase profile to a discrete number of phase levels are considered. The optimization of a simple structure with only four phase levels is reported, showing good results in terms of diffraction efficiency and angular bandwidth. © 2002 Society of Photo-Optical Instrumentation Engineers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
