JP2004271600A - Optical material with randomly distributed scatterers, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical material which is randomly distributed with scatterers and which is applicable to an optical waveguide, optical resonator, laser, etc., is strong to nonuniformity in the sizes of the scatterers and the deviation in the positions of the scatterers, has an isotropic photonic gap of a broad energy width and permits manufacturing of the optical waveguides and cavities of arbitrary shapes. <P>SOLUTION: A plurality of the microscatterers (1) which are composed of solid, liquid, gas or vacuum of n<SB>1</SB>in refractive index and have the maximum length in a light progression direction of 1/0 to 10 times the wavelength of light are randomly arranged within a medium (4) of a refractive index n<SB>2</SB>and the optical material (3) randomly distributed with the scatterers of ≥2.2 in n<SB>1</SB>/n<SB>2</SB>or ≥2.2 in n<SB>2</SB>/n<SB>1</SB>and 10 to 90% in volume fraction of the scatterers (1) over the entire part of the material (3) is provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The invention of this application relates to an optical material in which scatterers are randomly distributed. More specifically, the invention of this application is applied to optical waveguides, optical resonators, lasers, and the like, and isotropic photonics having a wide energy width that are strong against non-uniform scatterer size and displacement of scatterers. The present invention relates to an optical material having a gap and capable of producing an optical waveguide or a cavity having an arbitrary shape and having scatterers randomly distributed.
[0002]
[Prior art and its problems]
Conventionally, a structure in which a refractive index produced by arranging scatterers and having a periodicity on the order of light wavelength is called a photonic crystal. For example, a solid pillar (scatterer) vertically arranged on a lattice point of a two-dimensional square lattice or a triangular lattice in air or vacuum is an example of a photonic crystal. A wavelength band called a photonic gap, in which light cannot propagate, appears depending on the magnitude and periodicity of the rate.
[0003]
In addition, if a defect is introduced by removing some of the pillars in the photonic crystal, only light of a certain wavelength in the photonic gap can pass through only the defect, so that the photonic crystal has a very small size. It is expected to be applied to a wide range of fields as a material for optical circuits and high-performance light-emitting devices (see Patent Document 1).
[0004]
However, it is important for the production that the photonic gap is resistant to uneven size of the scatterer and displacement of the position of the scatterer, and that the photonic gap is isotropic and an arbitrary optical waveguide or cavity can be formed. Is important for applications, but the disadvantage of photonic crystals is that if the size of the scatterer is not uniform or the position of the scatterer is shifted from the target position, the photonic gap is likely to be broken. is there. In addition, since the photonic gap of a photonic crystal is anisotropic, such as the position and width of the photonic gap changing depending on the incident angle of light, when forming an optical waveguide in a photonic crystal, the optical waveguide must be The wavelength of the light to be transmitted must be within the photonic gap in all the traveling directions, and this property limits the design of the optical waveguide, and has a disadvantage that it is difficult to form an optical waveguide or a cavity having an arbitrary shape.
[0005]
For example, in a photonic crystal in which columns are vertically arranged on lattice points of a two-dimensional square lattice, it is considered that some of the columns are removed to form an optical waveguide. In this case, the optical waveguide is manufactured by combining a plurality of line segments. A 90 ° bend can be easily made by combining two perpendicular segments. On the other hand, if it is desired to bend light at an arbitrary angle, more line segments will be combined, and light will be scattered at the joints, thereby lowering the transmittance. Therefore, an optical waveguide having many joints and branches cannot be practically manufactured.
[0006]
If an attempt is made to fill the periphery of an optical waveguide or cavity having many joints or branches with a photonic crystal, an extra gap is formed, and light scattering or localization occurs in the gap, and the transmittance is reduced. It had the disadvantage that it decreased.
[0007]
For this reason, an optical material having an isotropic photonic gap and capable of producing a complicated optical waveguide or cavity has been strongly desired.
[0008]
Heretofore, research has been conducted on a material in which scatterers having a size about the wavelength of light are randomly distributed (Non-Patent Document 1), but by using such a material, it is necessary to provide a photonic gap. Has not succeeded.
[0009]
Further, an optical material having non-linear optical characteristics by dispersing fine particles of a metal such as copper having a diameter of about several nm in glass is also known (Non-Patent Document 2). It is much smaller than the wavelength of light, and this optical material has no photonic gap.
[0010]
[Patent Document 1]
Patent No. 3376411
[Non-patent document 1]
Isaac Freund, Michael Rosenbluh, Richard Berkovits, and Moshe Kaveh, "Coherent Backscattering of Light in a Quasi-Two-dimensional, Long-term, Lifestyle, Six-Two-Dimensional Edition. 1214-1217, 1988
[Non-patent document 2]
Y. Takeda, V .; T. Grisina, N .; Umeda, C.I. G. FIG. Lee and N.M. Kishimoto "Linear and nonlinear optical properties of Cu nanoparticles fabricated by high-current current education in a part of the nation's largest part of a license." 1029-1033, 1999
[0011]
Therefore, the invention of this application has been made in view of the circumstances described above, and solves the problems of the prior art, and can be applied to optical waveguides, optical resonators, lasers, etc. To provide an optical material in which scatterers are randomly distributed, with which an isotropic photonic gap with a wide energy width can be manufactured, which is resistant to non-uniformity and displacement of the scatterers, and which can produce optical waveguides and cavities of any shape. Is an issue.
[0012]
[Means for Solving the Problems]
The invention of this application solves the above-mentioned problems. First, an optical material that blocks light in a specific wavelength band, and has a refractive index of n ₁ A plurality of minute scatterers having a maximum length in the light traveling direction of not less than 1/10 and not more than 10 times the wavelength of light having a refractive index n ₂ Are randomly arranged in the medium of ₁ / N ₂ Is 2.2 or more and 10 or less or n ₂ / N ₁ Is not less than 2.2 and not more than 10 and the volume fraction of the scatterers in the whole optical material is not less than 10% and not more than 90%.
[0013]
Secondly, the invention of this application provides the optical material according to the first invention, wherein the scatterer is randomly distributed, wherein the medium is air.
[0014]
Thirdly, the invention of this application is directed to an optical material in which the scatterers of the first or second invention are randomly distributed, wherein the refractive index n ₁ Are fine columnar scatterers having a diameter of 1/10 to 10 times the wavelength of light, and the plurality of fine columnar scatterers have a refractive index n. ₂ An optical material in which scatterers are randomly distributed in parallel in a medium and in a direction perpendicular to the axis is provided.
[0015]
Fourth, a linear or curved optical waveguide that transmits light in a specific wavelength band is formed in an optical material in which the scatterers according to any one of the first to third aspects are randomly distributed. The present invention provides an optical material in which characteristic scatterers are randomly distributed.
[0016]
Fifthly, in the optical material in which the scatterer according to any one of the first to third aspects is randomly distributed, a cavity in which the electric field intensity of light is enhanced is formed. Provides an optical material having a random distribution.
[0017]
Sixth, in the fourth aspect, a part of the scatterer and the medium are removed in a straight line or a curved line, and an optical waveguide that transmits light in a specific wavelength band is formed in a portion where the scatterer and the medium are removed. And a method for producing an optical material in which scatterers are randomly distributed.
[0018]
Seventh, in the fourth invention, a linear or curved portion having a constant width that is used as an optical waveguide is set, and both edges of the linear or curved portion are regularly arranged with scatterers as side walls. A method for manufacturing an optical material in which scatterers are randomly distributed, wherein an optical waveguide is formed side by side and the periphery of the optical waveguide is filled with the scatterer and a medium.
[0019]
Eighth, in the fifth invention, a part of the scatterer and the medium are removed, the removed part is formed into a circular, spherical, polygonal or polyhedral shape, and the removed part is defined as a cavity. The present invention provides a method for producing an optical material in which scatterers are randomly distributed.
[0020]
Ninth, in the fifth aspect, a circular, spherical, polygonal, or polyhedral portion serving as a cavity is set, and scatterers are regularly arranged as side walls of the cavity to form a cavity. Embedded in the scatterer and a medium so as to enhance the electric field intensity of light inside the cavity.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention of this application has the features as described above, and embodiments thereof will be described below.
[0022]
The optical material of the invention of this application in which scatterers are randomly distributed is an optical material that blocks light in a specific wavelength band, and has a refractive index of n. ₁ And a plurality of minute scatterers having a maximum length in the light traveling direction that is 1/10 to 10 times the wavelength of light incident on the optical material, and has a refractive index n ₂ Are randomly arranged in the medium of ₁ / N ₂ Is 2.2 or more and 10 or less or n ₂ / N ₁ Is not less than 2.2 and not more than 10 and the volume fraction of the scatterer in the entire optical material is not less than 10% and not more than 90%.
[0023]
For example, if the medium is n ₂ Is 1 or air and vacuum, and a solid scatterer is arranged in the air or vacuum, the refractive index n of the scatterer ₁ If the value is not less than 2.2 and not more than 10, no photonic gap appears. It is also possible to make a hole in the solid medium and make the hole a scatterer. In this case, for example, if the scatterer is air or vacuum, the refractive index n of the scatterer ₁ Is 1, the refractive index n of the medium ₂ If the value is not less than 2.2 and not more than 10, no photonic gap appears. Furthermore, if the volume fraction of the scatterer in the entire optical material is not less than 10% and not more than 90% in addition to the above-mentioned condition of the refractive index, the photonic gap does not appear. This is because if the volume fraction of the scatterer is smaller than 10%, a gap through which light escapes in the optical material is created, and the photonic gap is collapsed, and all have the same radius. This is because a cylindrical scatterer is filled at a volume fraction of 90% when it is closest packed.
[0024]
Semiconductors and insulators are suitable for the scatterer. In particular, Si, Si compounds, GaAs, InP, TiO ₂ Semiconductors in which the conductivity and the like are adjusted by appropriately mixing impurities are listed. Of course, other substances can be used as scatterers as long as they satisfy the above conditions, and are suitable as a medium. As an example, air can be used, but other substances can be used as a medium as long as they satisfy the above conditions.
[0025]
Further, the optical material in which the scatterers of the invention of this application are randomly distributed has a refractive index n ₁ Are made into a columnar shape, and these columnar fine scatterers are referred to as a refractive index n ₂ By arranging them in parallel in the medium and randomly in the direction perpendicular to the axis, light of a specific wavelength band incident on the optical material can be suitably blocked.
[0026]
Further, the optical material in which the scatterers of the invention of the present application are randomly distributed can form a linear or curved optical waveguide that transmits light in a specific wavelength band. The body and the medium are removed in a straight line or a curved line, and an optical waveguide that transmits light in a specific wavelength band can be formed in a portion where the scatterer and the medium are removed. In this case, after removing the scatterer and the medium, it is desirable to arrange the scatterer as a side wall of the optical waveguide regularly at both edges of the linear or curved portion.
[0027]
Alternatively, a linear or curved portion having a constant width is set as an optical waveguide, and the optical waveguide is formed by regularly arranging scatterers as side walls on both edges of the linear or curved portion, and forming the optical waveguide. An optical material in which scatterers are randomly distributed can be formed by burying a scatterer and a medium around.
[0028]
By these methods, it is possible to form an optical waveguide of any shape having an isotropic photonic gap with a wide energy width, which is resistant to uneven size of the scatterer and displacement of the scatterer.
[0029]
Further, in the optical material in which the scatterers of the invention of the present application are randomly distributed, a cavity in which the electric field intensity of light inside is enhanced can be formed, and at that time, some scatterers and a medium are removed. The removed portion may have a circular, spherical, polygonal, or polyhedral shape, and the removed portion may be used as a cavity to enhance the electric field strength of light therein. In this case, after removing the scatterer and the medium, it is desirable to arrange the scatterer as a side wall of the cavity regularly around the periphery of the circular, spherical, polygonal or polyhedral shape.
[0030]
Alternatively, a circular, spherical, polygonal, or polyhedral portion serving as a cavity is set, the scatterers are regularly arranged as side walls on the peripheral portion of the cavity, a cavity is formed, and the scatterer and a medium are formed around the cavity. By filling in with, the scatterer having a cavity in which the electric field strength of light is enhanced can be made an optical material in which the scatterer is randomly distributed, whereby the size of the scatterer is uneven and the position of the scatterer is shifted. A cavity having an arbitrary shape having a strong isotropic photonic gap having a wide energy width can be obtained.
[0031]
The design of the optical material in which the scatterers of the invention of this application are randomly distributed is performed as follows.
[0032]
First, the overall size and shape, the size and number of scatterers, and the refractive index n ₁ , The refractive index n of the medium ₂ Then, under the condition that the center of the scatterer falls within the optical material, a random number for determining the center coordinates is created and the scatterer is arranged in the medium. With such a design, an optical material in which the scatterers of the invention of this application are randomly distributed can be manufactured.
[0033]
Next, the design of an optical material in which scatterers including optical waveguides and cavities are randomly distributed is performed as follows.
[0034]
First, the overall size and shape of the optical material in which the scatterers are randomly distributed are determined, and then the shape of the optical waveguide or cavity to be formed therein is determined, and the scatterers are regularly arranged on the side walls. The reason for arranging them regularly is to avoid scattering of extra light from the side wall portions. Then, the scatterer is arranged inside the random optical material other than the optical waveguide and the portion to be the cavity, and the arrangement method is the same as the random optical material method described first. By doing so, an optical material in which scatterers including optical waveguides and cavities are randomly distributed can be manufactured.
[0035]
Hereinafter, embodiments will be described with reference to the accompanying drawings, and embodiments of the present invention will be described in more detail. Of course, the present invention is not limited to the following examples, and it goes without saying that various aspects are possible in detail.
[0036]
【Example】
<Example 1>
FIG. 1 is a diagram showing one embodiment of an optical material in which scatterers of the invention of the present application are randomly distributed, when viewed from above.
[0037]
(1) is a columnar scatterer, where the radius of the scatterer (1) is a and the vertical length d is 53.7a and the horizontal length w is 84.7a. 200 scatterers (1) are set up randomly at right angles to the plane.
[0038]
In this case, the volume fraction of the entire optical material (3) in which the scatterers of the scatterer (1) are randomly distributed is 14%. The calculation result of the light transmission spectrum when the refractive indexes of the scatterer (1) and the medium (4) are set to 3.46 and 1, respectively, is shown as an upper curve in FIG. Ω on the horizontal axis is defined by Ω = 2πa / λ (λ is the wavelength of incident light). In order to prevent overlap with the lower curve, the light transmittance is set to 10 ⁵ It is shown twice. In the calculation, the light (5) was incident from above in FIG. 1, and the light transmittance was determined by calculating the light intensity by the horizontal line (6). It can be seen that there is a frequency region (photonic gap) where the light transmittance is very small around Ω = 0.4. The position and width of the photonic gap did not change even when the light incident angle was changed.
[0039]
That is, the photonic gap was found to be isotropic. Also, the optical material (3) in which other scatterers are randomly distributed except for the position of the cylindrical scatterer (1) made in the same manner as the optical material (3) in which the scatterers in FIG. The position and width of the photonic gap are also the same, which indicates that the photonic gap of the optical material (3) in which the scatterers are randomly distributed is strong against the displacement of the scatterer (1).
[0040]
Further, a calculation result of a light transmission spectrum when the radius of each scatterer (1) is independently and randomly changed within a range of ± 20% is shown as a lower curve in FIG. A photonic gap similar to the upper curve is seen, indicating that the radius of the columnar scatterer (1) is unevenly strong. In these calculations, polarized light (TM mode) in which the electric field of light is parallel to the scatterer (1) was used. n ₁ Is 4 or more, a photonic gap appears even in polarized light (TE mode) in which the electric field of light is perpendicular to the scatterer (1).
[0041]
Also, a photonic gap appears in the TE mode even when an optical material in which scatterers are randomly distributed, such as a scatterer formed by making holes in a solid medium. In order to make the wavelength of light, which is widely used in optical communication, 1.55 μm come to the center of the photonic gap, the radius of the scatterer may be 0.11 μm.
<Example 2>
Next, FIG. 3 shows a view of an embodiment of the optical material in which the scatterers of the invention of the present application are randomly distributed, which is different from Example 1 when viewed from above.
[0042]
(7) is a columnar scatterer, where the radius of the scatterer (7) is a and the vertical length d is 33.3a and the horizontal length w is 37.5a. 200 columnar scatterers (7) are set up vertically perpendicular to the plane at random. In this case, the volume fraction of the entire optical material (9) in which the scatterers of the scatterer (7) are randomly distributed is 50%, and the refractive indices of the scatterer (7) and the medium (10) are 3.46, respectively. FIG. 4 shows the calculation results of the light transmission spectrum when the values are set to 1 and 1. In the calculation, the light (11) was incident from above in FIG. 3, and the light transmittance was determined by calculating the light intensity at the horizontal line (12). It can be seen that photonic gaps exist near Ω = 0.54, 0.93, 1.34. Even in a photonic crystal in which cylindrical scatterers (7) are periodically arranged, a photonic gap may appear in a high energy region, but the width is usually narrower than that of a photonic gap having the lowest energy. . On the other hand, in the optical material (9) in which the scatterers are randomly distributed, the width of the third photonic gap is substantially equal to the width of the first photonic gap. This is very important for applications. In order for the wavelength 1.55 μm of light widely used in optical communication to come to the center of the third photonic gap, the radius of the columnar scatterer (7) may be 0.33 μm. Since it is three times larger than 0.11 μm in the first embodiment, the fabrication becomes easier. In this calculation, polarization (TM mode) in which the electric field of light is parallel to the scatterer (7) was used.
<Example 3>
FIG. 5 shows a layout of a columnar scatterer (15) of an optical material (14) in which scatterers including an L-time optical waveguide (13) are randomly distributed.
[0043]
This arrangement was determined as follows. First, a region (16) of the optical material (14) in which scatterers are randomly distributed is determined. Next, the shape of the part to be the optical waveguide to be formed therein is determined, the scatterers (15) are regularly arranged on the side wall thereof, and the scatterers (15) are randomly arranged in portions other than the part to be the optical waveguide (13). I do. The volume fraction of the entire optical material (14) in which the scatterers of the scatterer (15) other than the optical waveguide (13) are randomly distributed is 14%, and the refractive indices of the scatterer (15) and the medium (17) are respectively 3.46 and 1. The radius of the scatterer (15) is independently and randomly changed within a range of ± 20%. FIG. 6 shows the light transmittance at the position of the line (19) when the light (18) is incident from above. In this calculation, a polarization (TM mode) in which the electric field of light is parallel to the scatterer (15) was used. A frequency region surrounded by a dotted line is a photonic gap, and light (18) does not pass through portions other than the optical waveguide (13). On the other hand, it can be seen that the light transmittance at the position of the line (19) is large over a wide range within the photonic gap, and the light (18) passes only inside the optical waveguide (13). As described above, the light has been successfully bent at 90 °, and the light can be bent at an angle other than 90 °.
<Example 4>
Next, FIG. 7 shows an arrangement diagram of a columnar scatterer (22) of an optical material (21) in which scatterers including a branched optical waveguide (20) are randomly distributed. Except for the difference in the shape of the part to be the optical waveguide, the method of determining the arrangement is the same as that in FIG. The volume fraction of the entire optical material (21) in which the scatterers of the scatterer (22) other than the optical waveguide (20) are randomly distributed is 14%, and the refractive indices of the scatterer (22) and the medium (23) are respectively 3.46 and 1. The radius of the scatterer (22) is independently and randomly changed within a range of ± 20%.
[0044]
The light transmittance at the positions of the lines (25) and (26) when the light (24) is incident from above is shown as an upper curve and a lower curve in FIG. In order to prevent overlap with the lower curve, the light transmittance of the upper curve is set to 10 ⁵ It is shown twice. In this calculation, a polarization (TM mode) in which the electric field of light is parallel to the scatterer (22) was used. A frequency region surrounded by a dotted line is a photonic gap, and light does not pass through portions other than the optical waveguide (20). On the other hand, the light transmittance at the positions of the lines (25) and (26) is large over a wide range within the photonic gap, and it can be seen that the light (24) passes only through the optical waveguide (20). Thus, the light (24) is successfully branched. Branching at other angles is also possible. The upper curve and the lower curve slightly differ in the frequency region where the light transmittance is large. This indicates that light can be transmitted through only one of the optical waveguides if the wavelength is selected.
<Example 5>
FIG. 9 shows a layout of a columnar scatterer (29) of an optical material (28) in which scatterers including an S-shaped optical waveguide (27) are randomly distributed. Except for the difference in the shape of the portion to be the optical waveguide, the method for determining the arrangement is the same as that in FIG.
[0045]
The volume fraction of the entire optical material (28) where the scatterers of the scatterer (29) other than the optical waveguide (27) are randomly distributed is 14%, and the refractive indices of the scatterer (29) and the medium (30) are respectively 3.46 and 1. The radius of the scatterer (29) is independently and randomly changed within the range of ± 20%.
[0046]
FIG. 10 shows the light transmittance at the position of the line (32) when the light (31) is incident from above. In this calculation, polarized light (TM mode) in which the electric field of light is parallel to the pillar was used. The frequency region troubled by the dotted line is a photonic gap, and light does not pass through portions other than the optical waveguide (27). On the other hand, the light transmittance at the position of the line (32) is large over a wide range within the photonic gap, and it can be seen that light passes only through the optical waveguide (27). Thus, a curved optical waveguide was successfully produced.
<Example 6>
FIG. 11 shows a layout of a columnar scatterer (35) of an optical material (34) in which scatterers including a funnel-type optical waveguide (33) are randomly distributed. Except for the difference in the shape of the portion to be the optical waveguide, the method for determining the arrangement is the same as that in FIG. The volume fraction of the entire optical material (34) where the scatterers of the scatterers (35) other than the optical waveguide (33) are randomly distributed is 14%, and the refractive indexes of the scatterers (35) and the medium (36). Were set to 3.46 and 1, respectively. The radius of the scatterer (35) is independently and randomly changed within a range of ± 20%.
[0047]
FIG. 12 shows the light transmittance at the position of the line (38) when the light (37) is incident from above. In this calculation, polarized light (TM mode) in which the electric field of light is parallel to the pillar was used. A frequency region surrounded by a dotted line is a photonic gap, and light does not pass through portions other than the optical waveguide (33). On the other hand, the light transmittance at the position of the line (38) is large over a wide range in the photonic gap, and it can be seen that light passes only through the optical waveguide (33). An optical waveguide with a changed width was also successfully manufactured. There is also a frequency region where the light transmittance is significantly larger than 1. This indicates that light can be collected.
<Example 7>
FIG. 13 shows a cylindrical scatterer (41) of an optical material (40) in which scatterers including a cavity (39) composed of one large circle (39A), two small circles (39B) and (39C) are randomly distributed. FIG. Except for the difference in shape, the method for determining the arrangement is the same as that in FIG. The volume fraction of the entire optical material (40) in which the scatterers of the scatterer (41) other than the cavity (39) are randomly distributed is 14%, and the refractive indexes of the scatterer (41) and the medium (42) are 3 respectively. .46 and 1. The electric field intensity of light when the light (43) having the wavelength in the photonic gap is incident from above is shown by contour lines. In this calculation, polarized light (TM mode) in which the electric field of light is parallel to the pillar was used. Six portions in a large circle, one portion in a small circle, and a portion with a strong electric field strength appear simultaneously. This means that the electric field intensity of light in the cavity (39) was successfully increased, and this property can be applied to an optical resonator and a laser. On the other hand, the electrolysis strength outside the cavity is very weak, because light cannot enter inside due to the presence of the photonic gap.
[0048]
【The invention's effect】
As described in detail above, according to the invention of this application, it is applicable to optical waveguides, optical resonators, lasers, etc., and isotropic with a wide energy width, which is strong against unevenness in the size of the scatterer and displacement of the position of the scatterer. Provided is an optical material having a photonic gap and capable of producing an optical waveguide or a cavity having an arbitrary shape and in which scatterers are randomly distributed.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating an embodiment of an optical material in which scatterers of the present invention are randomly distributed.
FIG. 2 is a graph showing light transmittance of an optical material in which scatterers of FIG. 1 are randomly distributed.
FIG. 3 is a conceptual diagram illustrating another embodiment of the optical material of the present invention in which scatterers are randomly distributed.
FIG. 4 is a graph showing light transmittance of an optical material in which the scatterers of FIG. 3 are randomly distributed.
FIG. 5 is a conceptual diagram illustrating another embodiment of the optical material of the present invention in which scatterers are randomly distributed.
FIG. 6 is a graph showing light transmittance of an optical material in which the scatterers of FIG. 5 are randomly distributed.
FIG. 7 is a conceptual diagram illustrating still another embodiment of the optical material in which the scatterers of the invention of this application are randomly distributed.
8 is a graph showing light transmittance of an optical material in which the scatterers of FIG. 7 are randomly distributed.
FIG. 9 is a conceptual diagram illustrating another embodiment of the optical material of the present invention in which scatterers are randomly distributed.
FIG. 10 is a graph showing light transmittance of an optical material in which the scatterers of FIG. 9 are randomly distributed.
FIG. 11 is a conceptual diagram illustrating another embodiment of the optical material of the present invention in which scatterers are randomly distributed.
FIG. 12 is a graph showing light transmittance of an optical material in which the scatterers of FIG. 11 are randomly distributed.
FIG. 13 is a conceptual diagram illustrating another embodiment of the optical material of the present invention in which scatterers are randomly distributed.
[Explanation of symbols]
1, 7, 15, 22, 29, 35, 41 (Cylindrical) scatterers
2, 8, 16 areas
3, 9, 14, 21, 28, 34, 40 Optical material in which scatterers are randomly distributed
4, 10, 17, 23, 30, 36, 42 Medium
5, 11, 18, 24, 31, 37, 43 light
6, 12, 19, 25, 26, 32, 38 lines
13, 20, 27, 33 Optical waveguide
39 cavities

Claims (9)

An optical material that blocks light having a specific wavelength band, the refractive index is n ₁ solid, liquid, the maximum length of the result beam direction from gas or vacuum at less than 10 times less than 1/10 of the wavelength of light A plurality of minute scatterers are randomly arranged in a medium having a refractive index of n ₂ , and n ₁ / n ₂ is 2.2 or more and 10 or less, or n ₂ / n ₁ is 2.2 or more and 10 or less. An optical material in which scatterers are randomly distributed, wherein the volume fraction of the scatterers in the entire optical material is 10% or more and 90% or less. 2. The optical material according to claim 1, wherein the medium is air. 3. The optical material according to claim ₁ , wherein the plurality of minute scatterers having a refractive index of n1 have a diameter of at least 1/10 and at most 10 times the wavelength of light. a Do scatterers, optical scattering body characterized by being arranged at random in the parallel and perpendicular to the axis direction into a plurality of cylindrical micro scattering thereof is in the medium of refractive index n ₂ are distributed randomly material. The scatterer according to claim 1, wherein the scatterer is randomly distributed, wherein a linear or curved optical waveguide for transmitting light in a specific wavelength band is formed. Optical material randomly distributed. 4. The optical material according to claim 1, wherein a scatterer is randomly distributed in the optical material, wherein a cavity is formed inside the scatterer, the electric field intensity of light being enhanced. material. 5. The scatterer according to claim 4, wherein a part of the scatterer and the medium are removed in a straight line or a curve, and an optical waveguide for transmitting light in a specific wavelength band is formed in a portion where the scatterer and the medium are removed. A method for producing an optical material in which is randomly distributed. A linear or curved portion having a constant width to be set as an optical waveguide is set, and an optical waveguide is formed by regularly arranging the scatterers on both side portions of the linear or curved portion as side walls to form an optical waveguide. 5. The method according to claim 4, wherein the surroundings are filled with the scatterer and a medium. 6. The method according to claim 5, wherein a part of the scatterer and the medium is removed, and the removed part has a circular, spherical, polygonal or polyhedral shape, and the removed part is a cavity. A method for producing an optical material in which scatterers are randomly distributed. Circular, spherical, polygonal or polyhedral parts to be cavities are set, scatterers are regularly arranged as side walls of the cavities to form cavities, and the surroundings of the cavities are filled with the scatterers and the medium, 6. The method according to claim 5, wherein the electric field intensity of the light inside the cavity is enhanced.

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