57 results about "Oblique reflection" patented technology

A MEMS mirror is disclosed having thickness correlated with the intensity profile of an impinging optical beam, so as to reduce moment of inertia of the MEMS mirror while preserving optical quality of the reflected beam. It is the mirror edges that contribute the most to the moment of inertia, while it is generally the mirror center that contributes the most to a reduction of the quality of an optical beam reflected from the mirror. Accordingly, by providing a mirror having laterally varying thickness matched to the local variation of the intensity of the optical beam, the quality of the latter may be preserved while the moment of inertia of the mirror may be significantly reduced. The thickness of MEMS mirrors may be varied continuously or stepwise; in one direction or in two mutually orthogonal directions.

The present invention relates, in general, to a light modulator having a variable blaze diffraction grating and, more particularly, to a light modulator having a variable blaze diffraction grating, in which a diffraction member rotates due to piezoelectric force so as to incline a reflective surface.

A projection display system includes a screen, an illumination projecting system to form an image using light radiated by a light source, to magnify the image, and to project the image along a rear side of the screen, and a reflection unit having an array of unit mirrors to reflect the image received from the illumination projecting system onto the screen, each of the unit mirrors having a first sloped reflection surface and a second reflection surface adjacent to the first reflection surface having a predetermined angle therebetween.

The present invention relates to the field of semiconductor photoelectronic device, and provides a resonant cavity based on a non-periodic sub-wavelength grating and a distributed bragg reflector (DBR). The resonant cavity based on a non-periodic sub-wavelength grating and a DBR has a feature of controlling distribution of a light standing wave field in the resonant cavity. The structure of the resonant cavity comprises from top to bottom: a DBR, a resonant cavity and a non-periodic sub-wavelength grating reflector. A planar incident light reaches the non-periodic sub-wavelength grating reflector through the resonant cavity to realize oblique reflection deflect towards the center of the resonant cavity, and the oblique reflection is subjected to multiple oscillation and coupling in the resonant cavity to form a stable standing wave field with light field energy concentrated on the middle portion of the resonant cavity, wherein the width of the standing wave field is determined by a structure of the non-periodic sub-wavelength grating, and therefore the structure of the non-periodic sub-wavelength grating is changed to achieve control of the width of the standing wave field in the resonant cavity. The problem is solved that a traditional resonant cavity cannot control the width of the standing wave field, and the resonant cavity based on the non-periodic sub-wavelength grating and the distributed bragg reflector can be widely applicable to the optical communication and optical system fields.