Abstract
Wide-viewing angle integral imaging by means of a negative refractive index planoconcave lens array is theoretically investigated. The optical properties of a negative refractive index lens are analyzed from the point of view of integral imaging. The effective focal length of a positive index planoconvex lens and a negative index planoconcave lens with the same surface spherical curvature R are approximated as fP,eff = 2R and fN,eff = 0.4 R, respectively. This short effective focal length of the negative index lens is advantageous for extending the viewing angle of the integral imaging. In addition, some other optical properties of a negative index lens are analyzed and compared for a positive index lens. Three-dimensional ray-tracing observation simulations of integral imaging systems with a negative index lens array and a positive index lens array are then performed, in a comparative study of the wide- ewing angle mode for integral imaging. A three-dimensional ray-tracing simulator for an integral imaging system is then developed. Some interesting issues that appear in the wide-viewing mode of integral imaging are discussed. The negative refractive index planoconcave lens was found to give a wider viewing angle of -60(deg.) approximately +60(deg.) and reduces aberration with only a single spherical planoconcave lens.
Highlights
Integral imaging (InIm) is considered to be one of the more feasible technologies for displaying three-dimensional (3D) objects [1,2,3]
The negative index planoconcave lens (NIL) and PIL systems have a similar aberration level, since the resolution level required for the NIL system is much higher than that for PIL, an observer of the present NIL system sees a low brightness image which originates from the lack of the focusing accuracy associated with NIL with respect to the tight requirement for a high resolution elemental image
We report on an investigation of the 3D imaging properties of an unusual high viewing angle −60(deg.) ~ +60(deg.), negative index plasnoconcave lens array
Summary
Integral imaging (InIm) is considered to be one of the more feasible technologies for displaying three-dimensional (3D) objects [1,2,3]. We theoretically investigate wide-viewing angle InIm using a negative refractive index lens array. It is possible to analyze the imaging characteristics of InIm with a negative index lens array as well as the optical properties of the negative index lens itself using only the Snell’s law. Regarding InIm, the most important feature of the negative index lens is its short effective focal length Using this unique property of the negative index lens, it becomes possible to construct wide-viewing angle InIm and study the imaging characteristics of the wide-viewing angle InIm by means of a negative index lens array. We expand out the meaning of the negative index lens to InIm and the imaging characteristics of wide-viewing angle InIm with a negative index lens array.
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