538 results about "Negative refraction" patented technology

An optical element using a medium exhibiting negative refraction, a carbon nano tube being used for the medium exhibiting negative refraction, is disclosed. There is also disclosed an optical system having a plurality of optical elements each formed of a medium exhibiting negative refraction, wherein the plurality of optical elements includes optical elements having different chromatic dispersions.

A metamaterial comprises a plurality of metallic nanowires embedded in a dielectric matrix. The metamaterial composite media provide broadband all-angle negative refraction and flat lens, superlens and curved hyperlens imaging in specific spectral regions over a wide range of frequencies including, for example, from deep infrared to ultraviolet frequencies.

A liquid crystal display (LCD) device include: first and second substrates, the first and second substrates having a plurality of pixels divided into at least two domains; a liquid crystal layer between the first and the second substrates, the liquid crystal layer having a different alignment direction in each domain; and first and second compensation films on outer surfaces of the first and second substrates, the first and second compensation films having a negative refractive anisotropy and having a triangle pattern.

The present invention relates to the optical lens field, and discloses a camera shooting optical lens. The lens comprises from an object side to an image side in order: an aperture, a first lens with positive refraction power, a second lens with negative refraction power, a third lens with positive refraction power, a fourth lens with negative refraction power, a fifth lens with positive refraction power and a sixth lens with negative refraction power. The camera shooting optical lens satisfies the relation as follows: 0.70<f1/f<0.80, 2.0<f2/f< 1.8, 1.9<f3/f<2.1, -2.6<f4/f<-2.2, 0.8<f5/f<1, -0.7< f6/f <-0.5 and 1.9<f3/f5<2.2. The camera shooting optical lens can satisfy the large aperture design requirement while shortening the optical total length and has good sensitivity appearance.

A periodic electromagnetic medium is disclosed that includes a surface that provides an interface with an ambient medium and a periodic structure that provides negative refraction within the medium of an incident electromagnetic field incident on the surface. In various embodiments the incident electromagnetic field is within a range of frequencies, the medium may include dielectric or metallic material, and has either a positive or negative effective index.

The invention discloses a camera lens. From the object side to the image side, the camera lens sequentially comprises a first lens with positive refraction power a convex object side surface, a second lens, a third lens, a fourth lens, a fourth lens with a concave object side surface, a fifth lens with positive refraction power, a sixth lens, and a seventh lens with negative refraction power; the camera lens also comprises a diaphragm arranged between an object to be shot and a second lens. The camera lens meets relation expressions of TTL/Img H<2.4 and 1.5<CTl/CT2<4, wherein TTL is the total length of the camera lens, Img H is a half of the diameter of the effective pixel area of the camera lens on an imaging surface, CT1 is the central thickness of the first lens, and CT2 is the central thickness of the second lens. Meeting the expressions above, the camera lens has the advantages of wide field angle (wide angle), miniaturization, high imaging quality and the like.

A tunable super-lens (TSL) for nanoscale optical sensing and imaging of bio-molecules and nano-manufacturing utilizes negative-index materials (NIMs) that operate in the visible or near infrared light. The NIMs can create a lens that will perform sub-wavelength imaging, enhanced resolution imaging, or flat lens imaging. This new TSL covers two different operation scales. For short distances between the object and its image, a near-field super-lens (NFSL) can create or enhance images of objects located at distances much less than the wavelength of light. For the far-zone, negative values are necessary for both the permittivity ε a permeability μ. While well-structured periodic meta-materials, which require delicate design and precise fabrication, can be used, metal-dielectric composites are also candidates for NIMs in the optical range. The negative-refraction in the composite films can be made by using frequency-selective photomodification.

An optical transmission device is provided with a first optical member having a negative refraction angle with respect to an incident angle of a beam and a second optical member having a positive refraction angle with respect to the incident angle, wherein the first and second optical members are arranged one each or more in tandem alternatively.

For the cost effective implementation of negative-index refraction, an anisotropic hyperbolic planar metamaterial comprising a first set of substantially parallel, unloaded and coplanar transmission lines, said first set being spaced with a periodicity dy a second set of substantially parallel, unloaded and coplanar transmission lines, said second set being spaced with a periodicity dx, further being coplanar and substantially orthogonal with said first set of transmission lines, wherein the periodicities of said first set and second set of transmission lines being governed by the relationship βx(fr)dx+βy(fr)dy=2π, where: βx and βy are the intrinsic propagation constants of electromagnetic waves of frequency fr propagating along the first and second set of transmission lines, respectively.

A photographic optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a positive or negative refractive power, and a third lens unit having a positive or negative refractive power, focusing being performed by moving the second lens unit, wherein at least one diffractive optical element and at least one optical element made of solid material are provided closer to the object side than a position where a paraxial chief ray intersects an optical axis, and wherein a focal length obtained by only a diffraction component of the diffractive optical element, a focal length of the optical element made of solid material, a focal length of the first lens unit, and a relative anomalous partial dispersion of a material forming the optical element made of solid material are appropriately set.

A projection optical system and an image projection apparatus that are small in size and can achieve projection with a wide angle while a good image forming performance is assured includes a first lens group having a negative refracting power and a second lens group also having a negative refracting power. The first and second lens groups are arranged in order from the projection side. The first lens group includes a negative meniscus lens that has a concave surface directed to the projection side and formed as an aspherical reflecting surface.

The invention discloses an underwater sub-wavelength resolution ratio three-dimensional imaging method. The underwater sub-wavelength resolution ratio three-dimensional imaging method includes the following steps: (1) a sound signal is emitted; (2) acoustic lens wave beams are formed; (3) the sound signal is received and adjusted; (4) an image is processed and displayed. A two dimensional datum is obtained according to an imaging rule of an acoustic lens, a distance datum is obtained by utilizing an emission time and a receiving time, and a three dimensional underwater sound datum is obtained by combining with an electric signal received by a underwater sound sensor. The three dimensional underwater sound image datum undergoes image enhancement and image segmentation and a three dimensional image of a target is achieved by use of an open-sourcing visualization program library visualization toolkit (VTK). A reflected sound wave is focused through the acoustic lens and forms the wave beam. Hardware circuits of a normal imaging system are greatly reduced. A sub-wavelength image is achieved due to the characteristic of negative refraction of a phonon crystal. The novel underwater sound sensor with a mesoscopic pressure resistance is utilized, the underwater sound sensor responds to an underwater sound signal well, and a faint underwater signal can be effectively transformed.

In a zoom lens of this invention, a first lens group having a positive refraction power, a second lens group having a negative refraction power, a third lens group having a positive refraction power, and a fourth lens group having a positive refraction power are arranged sequentially from an object side toward an image side, and the magnification is changed from the wide angle end of the zoom lens to the telephoto end thereof, and vice versa, by varying each distance between each pair of the first to the fourth lens groups. The first lens group includes a positive lens and a negative lens. The third lens group includes at least a positive lens and a negative lens arranged sequentially from the object side toward the image side. At least the positive lens of the third lens group is a spherical lens. That lens of the third lens group which is located closest to the image side is a lens having an aspherical surface on at least one surface thereof.

Negative refraction in photonic crystals and diffraction grating is used to design plano-concave lenses to focus plane waves. Microwave experiments are carried out to demonstrate negative refraction and the performance of these lenses. Demonstration of negative refraction of visible light is also performed for the grism. These lenses can be used in optical circuits, astronomical applications, etc.

An optical lens is provided. The optical lens having an optical axis comprises, in order from an object side to an image-forming side, a first lens having negative refraction power, a second lens having positive refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power, a fifth lens having positive refraction power, and a sixth lens having refraction power. The sixth lens has an inflection point on a surface toward the image-forming side, the inflection point is separated from an optical axis by a distance h13, the radius of the sixth lens is H3, and |h13/H13|≦0.55.