Achromatic negative index lens with diffractive optics. (22nd January 2015)

• Record Type: Journal Article
• Authors: Piao, Mingxu; Cui, Qingfeng; Zhang, Bo
• Is Part Of: Journal of optics. Volume 17:Number 2(2015:Feb.)
• Publication Date: 2015-01-22
• Subjects: diffractive optics -- negative index lens -- diffraction efficiency; 42.40.Lx -- 42.15.Fr; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8978/17/2/025608
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: In this paper, achromatization of a negative index lens is achieved by introducing the diffractive optical elements (DOEs) into the negative index lens. The diffraction efficiency of the negative index material (NIM) DOEs is deduced based on the special propagating laws and imaging properties of negative index lenses, and the expression for microstructure height is given. As an example, an achromatic refractive–diffractive negative index lens with 150 mm focal length and 15 mm entrance pupil diameter is discussed from wavelength 0.848 μ m through wavelength 0.912 μ m to wavelength 1.114 μ m. According to the deduced expression for the NIM DOEs, the diffraction efficiency is calculated, and the diffraction efficiency curve is fitted by interpolation.