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Abstract

Disclosed are a diffractive optical element, a design method thereof and the application thereof in a solar cell. The design method for a 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 component; obtaining a series of alternative modulation thicknesses which are mutually equivalent for each modulation thickness, wherein a difference between the corresponding modulation phases is an integral multiple of 2π; 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 limitations to the modulation thicknesses/modulation phases in the prior art and increases the diffraction efficiency, and the obtained diffractive optical element facilitates mass production by a modern photolithographic technique, which greatly reduces the cost. The diffractive optical element may also be applied to the solar cell, which provides an efficient and low-cost way for solar energy utilization.

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First Claim