Abstract: The present invention relates to light sensors for measuring light characteristics. In particular, the present invention relates to a light directionality sensor that is capable of measuring light characteristics such as the light direction, light collimation, and light distribution. According to a first aspect of the present invention there is provided a light directionality sensor comprising a photo-sensor (2), comprising a plurality of photo-sensitive elements (3), and a plurality of light-absorbing light selecting structures (1) arranged on the photo-sensor so as to form an array of light-absorbing light selecting structures. In the array of light-absorbing light selecting structures, a succession of at least some of the light-absorbing light selecting structures has varying structural characteristics.

Abstract: The present invention relates to light sensors for measuring light characteristics. In particular, the present invention relates to a light directionality sensor that is capable of measuring light characteristics such as the light direction, light collimation, and light distribution. According to a first aspect of the present invention there is provided a light directionality sensor comprising a photo-sensor (2), comprising a plurality of photo-sensitive elements (3), and a plurality of light-absorbing light selecting structures (1) arranged on the photo-sensor so as to form an array of light-absorbing light selecting structures. In the array of light-absorbing light selecting structures, a succession of at least some of the light-absorbing light selecting structures has varying structural characteristics.

Abstract: There is provided a wave guide comprising: a wave guiding medium, having an index of refraction and provided between first and second wave propagating planar structures at least said first planar structure comprises a plurality of slitted-apertures defining a length axis of the first reflective structure; the slitted apertures constructed and arranged to reflect a R-polarized component of said radiation oriented parallel to said length axis; and wherein said first planar structure is arranged between said wave guiding medium and an adjacent medium having an index of refraction equal or larger than the wave guiding medium. In one aspect of the invention, a waveguide is proposed to limit an excitation region wherein luminophores are excited; substantially independent from the surrounding media of the waveguide. Preferentially, the waveguide is used in a luminescence sensor.