Nano-Structured Lens for Collimating Light from Surface Emitters

摘要

A light source for providing light comprises a light emitting layer and a lens comprising a periodic structure therein that is periodic along at least one direction in a plane. The structure includes or is formed from at least two optically transparent materials of different optical indices. The lens is separated from the light emitting layer, and the radiation propagating from the light emitting layer within an angle to a line normal to the plane will be transmitted by the lens to a far field in an index-guided mode. The separation between the light emitting layer and the lens is such that near field radiation propagating from the light emitting layer towards the lens not within said angle to the line will be scattered and redirected by the first lens to the far field to thereby collimate the radiation propagating from the light emitting layer to the far field.

主权项

1. A light source for providing light, comprising:
a light emitting layer; and a first lens comprising a periodic structure therein that is periodic along at least one direction in a plane, said structure formed from at least two optically transparent materials of different optical indices, wherein said first lens is separated from the light emitting layer, and the radiation propagating from the light emitting layer within an angle to a line normal to the plane will be transmitted by the first lens to a far field in an index-guided mode, the separation between the light emitting layer and the lens being such that near field radiation propagating from the light emitting layer towards the lens not within said angle to the line will be scattered and redirected by the first lens to the far field to thereby collimate the radiation propagating from the light emitting layer to the far field.