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Optical element using liquid crystal having optical isotropy

An optical element, isotropic technology, applied to the field of optical elements using optically isotropic liquid crystals, can solve problems such as slow response speed

Inactive Publication Date: 2006-12-27
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, among the above-mentioned optical elements (lens elements and aberration correcting elements) using nematic liquid crystals and smectic liquid crystals, for example, in elements using nematic phases, the response speed is slow, and smectic phase ferroelectric liquid crystals are used. The effect of elements that improve responsiveness differs depending on the polarization state of incident light

Method used

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  • Optical element using liquid crystal having optical isotropy
  • Optical element using liquid crystal having optical isotropy
  • Optical element using liquid crystal having optical isotropy

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Embodiment approach 1

[0072]In Embodiment 1 of the present invention, a diffraction element and an optical attenuator are proposed and described as optical elements. FIG. 1 is a cross-sectional structural diagram conceptually showing a diffraction element according to Embodiment 1 of the present invention. In Fig. 1, the diffractive element 10 is constituted as follows: films of transparent electrodes 3, 4 are respectively formed on one surface of transparent substrates 5, 6, and each substantially rectangular parallelepiped is periodically arranged in parallel between the transparent electrodes 3, 4. The isotropic refractive index solid material forming the grid 2A, and the region between the isotropic refractive index solid material forming the grid 2A forms the diffraction grating 1 occupied by the isotropic refractive index liquid crystal 2B, formed by the transparent substrate 5 , 6 and sealing member 7 seal the isotropic refractive index liquid crystal 2B.

[0073] Here, the isotropic refrac...

Embodiment approach 2

[0099] In Embodiment 2 of the present invention, an element having a composition different from that of the diffraction element and the optical attenuator in Embodiment 1 is proposed and described as an optical element. Figure 8 is a cross-sectional view of a diffraction element according to Embodiment 2 of the present invention, Figure 9 is a top view of the diffraction element. In the diffraction element 40 according to Embodiment 2 of the present invention, transparent electrode 4 is removed from diffraction element 10 according to Embodiment 1 of the present invention, and patterned transparent electrodes 3A and 3B are provided instead of transparent electrode 3 .

[0100] Here, transparent electrodes 3A, 3B are formed so as to be sandwiched between transparent substrate 5 and grid 2A. The other components are the same as those of the diffraction element 10 according to Embodiment 1 of the present invention, and their descriptions are omitted. Therefore, the same compo...

Embodiment approach 3

[0108] In Embodiment 3 of the present invention, a variable wavelength filter is proposed as an optical element and described. Figure 10 It is a diagram showing a conceptual side cross-sectional structure of a variable wavelength filter according to Embodiment 3 of the present invention. Figure 10 Among them, the wavelength variable filter 50 is a filter called "liquid crystal standard type wavelength variable filter", which has a structure in which a pair of transparent substrates 56A and 56B are provided to face each other, and are substantially parallel to each other. A pair of reflective mirrors 53A and 53B forming an optical resonator, an isotropic refractive index liquid crystal 51 whose refractive index changes isotropically, and transparent electrodes 52A and 52B are arranged on transparent substrates 56A and 56B, and in 1 An isotropic refractive index liquid crystal 51 and a transparent and solid optical medium layer 58 (hereinafter, referred to as a solid optical m...

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Abstract

An optical element able to realize a response equal to or faster than that of a conventional one without depending on an incident polarization. The optical element comprises transparent substrates (5, 6), a lattice (2A) formed on the transparent substrate (5) by using an isotropic-refractive-index solid material and having a sectional structure of a cyclic unevenness, blue-phase liquid crystals (2B) filled in the recesses of the lattice (2A) having cyclic unevenness and having refractive index thereof changed isotropically, and transparent electrodes (3, 4) for applying a voltage to the blue-phase liquid crystals (2B), wherein a diffraction element (10) is formed by diffraction lattices (1) each consisting of a lattice (2A) and a blue-phase liquid crystal (2B), and the refractive index of the blue-phase liquid crystals (2B) constituting the diffraction element (10) is changed by a voltage applied via the transparent electrodes (3, 4).

Description

technical field [0001] The present invention relates to an optical element using an optically isotropic liquid crystal, and particularly relates to using the liquid crystal in a part of a diffraction grating, controlling the substantial refractive index of the liquid crystal by applying a voltage to the liquid crystal, and diffracting incident light into 0-order diffraction Diffraction elements for controlling the light quantity of light (transmitted light), optical attenuators, variable wavelength filters for selectively and variably extracting optical signals of desired wavelengths from wavelength-division multiplexed optical signals, wavefront control elements, control stations The effective refractive index of the liquid crystal used in the above-mentioned wavefront control element makes the liquid crystal present a lens effect, and the aberration compensation element compensates the wavefront of the outgoing light relative to the incident light to compensate for the wavefr...

Claims

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Application Information

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IPC IPC(8): G02F1/13G02B5/20G02B5/28G02F1/1334
Inventor 大井好晴野村琢治小柳笃史
Owner ASAHI GLASS CO LTD
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