外国特許コード F190009804
整理番号 S2017-1047-C0
掲載日 2019年5月8日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP035015
国際公開番号 WO 2019059342
国際出願日 平成30年9月21日(2018.9.21)
国際公開日 平成31年3月28日(2019.3.28)
  • 特願2017-181884 (2017.9.22) JP
発明の概要(英語) This optical waveguide device has a waveguide core layer (13) and a clad layer discontinuously covering the waveguide core layer (13). The clad layer has, in some regions thereof, a structure (12) which: extends between an end section of a disconnected part not covering the waveguide core layer and a position that is on the opposite side of the disconnected part along the waveguiding direction of the waveguide core layer and spaced apart from the waveguide core layer; and gradually approaches the waveguide core layer toward the waveguiding direction of the waveguide core layer, wherein a tangent line at the end section of the disconnected part is parallel or nearly parallel to the waveguide core layer. A light introduction core layer 14 covered with the clad layer (12) is provided so as to merge with the waveguide core layer at the disconnected part of the clad layer.
従来技術、競合技術の概要(英語) BACKGROUND ART
Waveguide is, in general, a constant region to confine the wave line that the transmission circuit or, in the direction determined by the physical boundaries of the confined electromagnetic waves, directed to a system or material designed for is defined. Conventionally, the electromagnetic wave, even in a long distance without causing a loss in the middle of the light waveguide as a structure, an optical fiber or a two-dimensional waveguide 2 (the slab optical waveguide) is well known. Typically, light is confined in the interior for transmission, the waveguide having a continuous translational symmetry. In addition, a portion of the small refractive index, that is surrounded by the cladding layer, the portion of the large refractive index, i. e. the core layer, and unevenness of the change in thickness of the upper surface may also have a one way flow, the cross-section is a simple closed surface. That is, the cross-sectional area S, L is defined as the area and peripheral length, cross-sectional area of S is, effectively, that is, by relatively short L, is surrounded. S-cL2 is given, 12-50 is 1/c (12 is a circle, 50 corresponds to the case of the wedge-shaped structure is flat) or the like in the amount of the order of 10 (for example, see Patent Document 1.).
In addition, the prior art using a planar substrate, a plurality of light together, the combined light into the light, has been developed is the multiplexer, this is because in an integrated circuit and, as a result (focusing) of the optical multiplexer, the demultiplexer, to reduce the loss over a few mm, a very sparse, about 34mm in only about 4 times is performed (see Non-Patent Document 1.). In the conventional system, the light-condensing distance of the net generated in the processes, and is basically a short distance (in such a case, the degree of integration increases in the future), densely of multiplexing (the number m to several tens cm) long made over a system that did not exist. Since the target information processing, the presence of light in the linear region.
Of existing solar cell, the bulk silicon, a thin film silicon, CIS including, in a great number of surface incident type, the material requires larger in proportion to the area. On the other hand, one side of the slab optical waveguide is disposed in the solar cell-edge-type solar cell (Patent Document 2, the reference 3.) Is, increases in proportion to the length of one side of it is only necessary, it does not require a small amount of material, the light manipulation is problematic. That is, two-dimensional light 3 need to be a two-dimensional light 2, the waveguide is necessary to gain a sufficient distance.
In recent years, for increasing the efficiency of solar power generation, in particular, in order to configure the system as the light collecting system, see Non-Patent Document 2 (Luminescent Solar Concentrator,LSC) (luminescent solar concentrator.) Is attracting attention. Therein, the three-dimensional waveguide 2 is included as an essential component. However is rendered, all the conventional, continuous translational symmetry of the symmetrical waveguide has assumed implicitly.
Conventional waveguide, the optical waveguide direction with respect to the forward and reverse direction, and have a symmetric structure, the optical waveguide core layer are basically continuously sandwiched between the cladding layer, the structure was wrapped, thereby preventing the leakage of light, confinement has been performed. Therefore, light is introduced into the waveguide core layer from the outside is extremely difficult. An optical waveguide with reduced efficiency because it is not desired, it can be said that in the first place has not assumed. Under such circumstances, conventional guide concentrated photovoltaic cell and the photoelectric conversion element and the coupling case, when the light is focused on efficiently been associated with very great difficulty. That is, out of light incident on the luminescent solar concentrator is because the component returns, not total internal reflection. A dye or a quantum dot luminescent solar concentrator is used in the dye or a quantum dot can absorb the sunlight is not full (out of a certain component). Further, and the reabsorption of the light by a dye, the dye is not a long life. Further, the light confined in the luminescent solar concentrator and it is difficult to persist, the light emission is basically isotropically and therefore, the total reflection condition is not satisfied out of the light returns also a space (see Non-Patent Document 3.). As a result, the photoelectric conversion efficiency in the solar cell cannot be increased.
In addition, such as a liquid crystal layer having a refractive index anisotropy is used as a cladding layer is been proposed, only some of the polarized light cannot be used, to maximize the efficiency of the appearance or limit, or, in order to avoid this, the same structure and the other pair such as is necessary to provide the, the problem of the complication of the structure they were.
In addition, in the above-described luminescent solar concentrator, the three-dimensional propagation of the sunlight 3, the three-dimensional waveguide 2 disposed in a dye or a quantum dot is absorbed once, and then, these dyes or a quantum dot energy relaxation occurs in the light coming in, the waveguide can be guided, or the photoelectric conversion element placed at the edge of the solar cell, electrical energy is, this series of processes with high efficiency is not easy (for example, see Non-Patent Document 1.). The reason for this is that such dyes, (1) quantum dots, the spectrum of sunlight over the entire surface, light cannot be absorbed by the dye or a quantum dot, (2) the re-absorption of and between, the energy relaxation in the quantum dot or dye in the loss, further, (3) the dye when the light-emitting quantum dots, therefore basically isotropically light-emitting, the three-dimensional waveguide 2 is totally reflected within the light guide are limited the proportion of the light (light emission of the light, 2 a three-dimensional waveguide surface in a vertical direction is, of course, the waveguide is confined within and without, external part of the light is emitted) and the like can be used.
In addition, the present invention may be the user himself, using the concept of another, in particular, the comb-shaped refractive index modulation structure is used, a two-dimensional propagation light 3 propagating light 2 can be a two-dimensional has been attempted, is not necessarily high and its efficiency (see Patent Document 4.). This is, based on light diffraction direction are used for conversion, the wavelength dependency is large, the refractive index modulation structure, the light incident direction, because it has a symmetric structure in a direction perpendicular to, the time-reversal symmetry of the conjointly with the effect of spatial inversion symmetry, basically, the propagation light 2 propagating light 3 and the two-dimensional or three-dimensional, the propagation light 2 in contrast to this two-dimensional or three-dimensional propagation light 3 cannot be attributed.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • 発明者(英語)