DIFFRACTIVE OPTICAL ELEMENT, DESIGN METHOD AND APPLICATION IN SOLAR BATTERY THEREOF

摘要

Disclosed are a diffractive optical element, a design method and the application in a solar battery thereof. The design method for the design modulation thickness of a sampling point of the diffractive optical element comprises: calculating the modulation thickness of the current sampling point for each wavelength; obtaining a series of alternative modulation thicknesses which are mutually equivalent for each modulation thickness, wherein the difference between the corresponding modulation phases is an integral multiple of 2pi; and selecting one modulation thickness from the alternative modulation thicknesses of each wavelength to determine the design modulation thickness of the current sampling point. In an embodiment, the design method introduces a thickness optimization algorithm into a Yang Gu algorithm. The design method breaks through the limitations on the modulation thicknesses/modulation phases in the prior art and increases the diffraction efficiency, and the diffractive optical element obtained is convenient for mass production through a modern lithographic technique, which greatly reduces the cost. The diffractive optical element can also be applied to the solar battery, which provides an efficient and low-cost way for solar energy utilization.