Provided are electromagnetic wave reflectors and optical devices including the same. An electromagnetic wave reflector may include a plurality of layers which have an aperiodic structure and/or thickness. The plurality of layers may satisfy a condition of spatial coherence with respect to electromagnetic waves. The electromagnetic wave reflector may include a plurality of first material layers including a first material having a first refractive index and a plurality of second material layers including a second material having a second refractive index different from the first refractive index. At least two of the plurality of first material layers may have different thicknesses. At least two of the plurality of second material layers may have different thicknesses. At least one of the plurality of first material layers and at least one of the plurality of second material layers may have different thicknesses.

This invention relates to a cold mirror for a head-up display apparatus and provides a cold mirror that enables suppression of a phenomenon of change in color tone of an image depending on a position from which the image is viewed. This invention also provides a head-up display apparatus including the cold mirror. In a head-up display apparatus, display light of an image displayed on a display is reflected by a cold mirror and a reflected image of the image is viewed by a viewer. A relationship between an incident wavelength and a reflection phase difference in the cold mirror is set so that the reflection phase difference falls within a range of 18060 degrees for an entire visible wavelength range of 420 to 680 nm.

A dielectric mirror includes a coating having alternating high and low index layers. The mirror coating has no metallic reflective layer of Al or Ag in certain example embodiments, and may have film side and/or glass side visible reflection of from about 50-90% (more preferably from about 60-80% and most preferably from about 65-75%) and visible transmission of from about 10-50% (more preferably from about 10-40% or 20-40%) in certain example embodiments.

A multi-reflector lighting apparatus including a reflector having a reflecting layer deposited on a base layer. The multi-reflector lighting apparatus further includes a first oxide layer deposited on the reflecting layer. The multi-reflector lighting apparatus further includes a second oxide layer deposited on the first oxide layer. The multi-reflector lighting apparatus further includes an alternating plurality of a relatively low refractive index oxide layer material and a relatively high refractive index oxide layer material deposited on the second oxide layer.

A coating composition comprising 6 to 20 alternating layers of SiO.sub.2 and one of ZrO.sub.2 or Nb.sub.2O.sub.5 wherein the thickness of each individual layer is about 70 nm to 200 nm is described. Also described is a substrate comprising a coating on at least a first major side thereof, the coating comprising 6 to 20 alternating layers of SiO.sub.2 and one of ZrO.sub.2 or Nb.sub.2O.sub.5 wherein the thickness of each individual layer is about 70 nm to 200 nm The substrate can be glass, plastic, or metal. Also disclosed herein are methods of making the coated substrate. The coatings have good optical transparency and NIR reflectivity.

A reflective mirror is provided with a base and a multilayer film including first layers and second layers laminated alternately on the base and capable of reflecting at least a portion of the incident light. The multilayer film is provided with a first portion having a first thickness, and with a second portion which has a second thickness different from the first thickness and which is provided at a position rotationally symmetric to that of the first portion about the optical axis of the reflective mirror relative.

A display device includes a light source which provide a first light, a color filter including a plurality of quantum dots which absorbs the first light and emits at least one of second light and third light that are different from the first light, a first optical filter layer disposed on the color filter, and a second optical filter layer disposed between the light source and the color filter. The first optical filter blocks at least a part of the first light, and the second optical filter transmits at least a part of the first light and reflects at least a part of the second light and the third light.

A dielectric mirror includes a coating having alternating high and low index layers. The mirror coating has no metallic reflective layer of Al or Ag in certain example embodiments, and may have film side and/or glass side visible reflection of from about 50-90% (more preferably from about 60-80% and most preferably from about 65-75%) and visible transmission of from about 10-50% (more preferably from about 10-40% or 20-40%) in certain example embodiments.

Mirrors for a deflection unit in a scanning system, scanning systems using such mirrors, and methods of manufacturing such mirrors are disclosed. In an embodiment, a mirror for a deflection unit in a laser system includes a sintered polycrystalline diamond body including a plurality of randomly oriented diamond grains defining a plurality of interstitial regions. At least a portion of the interstitial regions includes a material disposed interstitially therein. The mirror includes a reflective surface formed at least partially from the sintered polycrystalline diamond body or provided thereon. The reflective surface exhibits a surface roughness of less than about 50 nm Rrms.

An electro-optic modulator is a liquid-crystal-based electro-optical light modulator. The liquid-crystal-based electro-optical light modulator is fabricated using surface Micro-electromechanical Systems (MEMS) techniques. The electro-optical light modulator is used for inspecting flat panel displays or the like. Utilizing surface MEMS techniques for fabrication considerably thins the electro-optic modulator and allows the use of pure liquid crystal without the need for thick containment plates.