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Planar, high NA, low loss transmitting or reflecting lenses using sub-wavelength high contrast grating
Planar, high NA, low loss transmitting or reflecting lenses using sub-wavelength high contrast grating
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机译:使用亚波长高对比度光栅的平面,高NA,低损耗透射或反射透镜
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摘要
Planar lenses and reflectors are described comprising subwavelength high-contrast gratings (HCG) having high index of refraction grating elements spaced apart from one another in straight and/or curved segments and surrounded by low index material. The high-contrast grating is configured to receive an incident wave which excites multiple modes within the high-contrast grating and is focused for reflection and/or transmission by said high contrast grating. The width of the high contrast grating bars vary along a distribution direction of the grating bars which is perpendicular to the length of the grating bars and/or varies along the length of one or more grating bars to focus said reflection and/or transmission. The HCG is configured to provide double focusing, whose use is exemplified within a vertical cavity surface emitting laser (VCSEL) structure using focusing HCG structures for both the top and bottom mirrors.
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