Abstract:
An apparatus is provided for displaying an image to a viewer with reduced visual artifacts. The apparatus comprises a display panel (40) for forming the image using an array (40) of pixels (30) with distributed active regions (32). The distributed active regions (32) are divided into at least two simultaneously switched portions at least partly separated by or surrounding a significant portion of a non-switchable region (34). First order spatial harmonics and associated artifacts are reduced by the distributed apertures and second order and higher harmonics are reduced by limiting pixel subtense angle seen by the viewer.
Abstract:
different in refractive index in a single crystal material and controlling light in terms of refraction and reflection by partially controlling the spontaneous polarization direction of a crystal material, a production method thereof, and an optical component using the optical control element. The optical control element has at least two areas (10, 20) consisting of a crystal, having different refractive indexes due to different polarization directions, and contacting each other at the interface (15), and is uniform in composition over the entire two areas (10, 20) including the interface (15). A polarization direction is controlled by applying an electric field having such an electric field component that directs vector V toward a positive electric field, vector V satisfying vector V = vector Cb vector Ca, where Cb is direction vector in a polarization direction before controlling, and Ca is direction vector in a polarization direction after controlling.
Abstract:
A diffraction grating for a waveguide or for externally incident light. The grating includes a substrate and an electrooptic structure extending over it. The electrooptic structure may include a waveguide having a propagation axis. A first and a second electrode structure are provided on either side of the electrooptic structure so that an electric field is generated in the electrooptic structure when a potential is applied to the electrodes. The first electrode structure has an interdigitated configuration defining a plurality of fingers. In use, respective potentials V0 and V0 + DELTA V are applied to adjacent fingers. The diffraction grating induced in the electrooptic structure by the periodic electric field advantageously has a refractive index adjustable by varying V0 and DELTA V and a spatial periodicity adjustable by varying DELTA V.
Abstract:
An electromagnetic radiation switch (100) for performing a switch function in an electromagnetic radiation propagation path, the electromagnetic radiation switch (100) comprising a substrate (102), a regular arrangement of structures (104) formed on and/or in the substrate (102), wherein at least one of the structures (104) is a phase change material structure (104) changeable between at least two different phase states, and a control unit (106) adapted to control the phase state of the at least one phase change material structure (104) to thereby select one of a plurality of switching states for the electromagnetic radiation propagation path.
Abstract:
Wavelength converter device (100), for generating a converted radiation at frequency Ω g through interaction between at least one signal radiation at frequency Ω g and at least one pump radiation at frequency Ω g, comprising * an input (1) for said at least one signal radiation at frequency Ω g; * a pump light source (3) for generating said at least one pump radiation at frequency Ω g; * an output (2) for taking out said converted radiation at frequency Ω g; * a structure (4) for transmitting said signal radiation, said structure (4) including one optical resonator (10) comprising a non-linear material, having an optical length of at least 40*η/2, wavelength η is the wavelength of the pump radiation, and resonating at the pump, signal and converted frequencies Ω p, Ω s and Ω¿g, ? characterized in that said structure (4) comprises a further optical resonator (20) coupled in series to said optical resonator (10), said further optical resonator (20) comprising a non-linear material, having an optical length of at least 40*η/2, wherein η is the wavelength of the pump radiation, and resonating at the pump, signal and converted Ω p, Ω s and Ω g; wherein by propagating through said structure (4) the pump and signal radiation generate said converted radiation by non-linear interaction within said optical resonators (10, 20).
Abstract translation:波长转换器装置(100),用于通过频率ωg至少一个信号辐射与频率ωg的至少一个泵浦辐射之间的相互作用产生频率ωg的转换辐射,包括*输入( 1)用于所述至少一个频率ωg的信号辐射; * *泵浦光源(3),用于以ω= g产生所述至少一个泵浦辐射; *输出(2),用于取出所述转换的 频率ωg的辐射;用于传输所述信号辐射的结构(4),所述结构(4)包括包括非线性材料的一个光学谐振器(10),其具有至少40 * eta / 如图2所示,波长eta是泵浦辐射的波长,并且在泵,信号和转换频率ωω,ω,ω和ω下共振,其特征在于所述结构(4)包括另外的光谐振器 (20),其与所述光学谐振器(10)串联耦合,所述另外的光学装置 (20)包括具有至少40 * eta / 2的光学长度的非线性材料,其中eta是泵浦辐射的波长,并且在泵谐振,信号和转换Omega> p, 其中通过传播所述结构(4),所述泵和信号辐射在所述光学谐振器(10,20)内通过非线性相互作用产生所述转换的辐射。
Abstract:
PROBLEM TO BE SOLVED: To provide a modulator, a transmitter, and a communication system capable of enhancing overall transfer rate of data.SOLUTION: An AWG 13 separates white light L emitted from a white LED 11 into a plurality of spectral light beams La-Ld having respective different wavelengths. A modulator 12 comprises a plurality of modulation means 14a-14d. The modulation means 14a applies voltage to a first electrode layer 141 and a second electrode layer 143 to generate a changing electric field in a material of a moth-eye structure layer 142. The electric field changes a refractive index of the moth-eye structure layer 142 to modulate the spectral light beam La. The modulation means 14b-14d also modulate the spectral light beams Lb-Ld in a similar manner. The modulation means 14a-14d modulate the spectral light beams La-Ld according to respective different signals.