Thermal radiation lens

Patent metadata

Field	Value
Publication number	US-2023350169-A1
Application number	US-202017639339-A
Country	US
Kind code	A1
Filing date	Aug 31, 2020
Priority date	Sep 2, 2019
Publication date	Nov 2, 2023
Grant date	—

Abstract

A thermal radiation lens is configured to control propagation of thermal radiation, by using a sheet-type material 10 which realizes high refractive-index, non-reflective, and non-polarizing optical properties for a frequency band of a thermal radiation region. The sheet-type material 10 according to the present embodiment includes a substrate 11, a first pattern array 12 arranged regularly in the X-axis direction and the Y-axis direction on one surface of the substrate 11, and a second pattern array 13 formed on the back surface of the substrate relative to the one surface to overlap with the first pattern array, wherein meta-atoms 12a, 13a included in first and second pattern arrays have the same shape and have a width in the X-axis direction and a width in the Y-axis direction which are equivalent to each other within a range of a half wavelength of the thermal radiation.

First claim

1 . A thermal radiation lens configured to control propagation of thermal radiation, comprising:
a substrate; a plurality of first patterns arranged, in a first region on one surface of the substrate, regularly in a first direction parallel to the one surface and in a second direction crossing the first direction; and a plurality of second patterns formed, in a second region overlapping with the first region, on a back surface of the substrate, to overlap with each of the plurality of first patterns, wherein, among the plurality of first patterns and the plurality of second patterns, a first pattern and a second pattern overlapping with each other with the substrate interposed therebetween have a same size and a same shape and have a width in the first direction and a width in the second direction equivalent to each other within a range of a half wavelength of the thermal radiation.

2 . (canceled)

3 . (canceled)

4 . The thermal radiation lens according to claim 1 , wherein
at least a portion of the plurality of first patterns and the plurality of second patterns is arranged with a gap interposed therebetween in the first direction and in the second direction, and the plurality of first patterns and the plurality of second patterns have a circular shape, and for a frequency 200 THz of the thermal radiation, a radius of the circular shape is from 120 nm to 145 nm, and the gap is from 10 nm to 60 nm, and for a frequency 50 THz of the thermal radiation, a radius of the circular shape is from 0.5 μm to 1.3 μm, and the gap is from 0.1 μm to 1.1 μm.

5 . The thermal radiation lens according to claim 1 , wherein
at least a portion of the plurality of first patterns and the plurality of second patterns is arranged with a gap interposed therebetween in the first direction and in the second direction, and the plurality of first patterns and the plurality of second patterns have a square shape, and for a frequency 200 THz of the thermal radiation, one side of the square shape is from 260 nm to 335 nm, and the gap is from 50 nm to 150 nm, and for a frequency 50 THz of the thermal radiation, one side of the square shape is from 1.6 nm to 2.0 μm, and the gap is from 0.1 nm to 0.5 μm.

6 . The thermal radiation lens according to claim 4 , wherein another portion of the plurality of first patterns and the plurality of second patterns is arranged adjacent to the at least the portion of the plurality of first patterns and the plurality of second patterns and arranged, in at least one of the first direction and the second direction, with another gap larger than the gap, interposed therebetween.

7 . The thermal radiation lens according to claim 1 , wherein another portion of the plurality of first patterns and the plurality of second patterns is disposed adjacent to at least a portion of the plurality of first patterns and the plurality of second patterns and has another width different from the width for at least one of the first direction and the second direction.

8 . The thermal radiation lens according to claim 1 , wherein the first region including the plurality of first patterns and the second region including the plurality of second patterns are arranged periodically in at least one axis direction parallel to the one surface.

9 . The thermal radiation lens according to claim 1 , wherein the substrate is a heat-tolerant dielectric film, and the plurality of first patterns and the plurality of second patterns are conductive metal films.

10 . The thermal radiation lens according to claim 9 , the substrate is formed of benzocyclobutene (BCB), polyimide, a quartz glass (SiO 2 ), or silicon nitride (Si 3 N 4 ).

11 . The thermal radiation lens according to claim 9 , wherein the plurality of first patterns and the plurality of second patterns are formed of gold, silver, copper, or aluminum.

12 . The thermal radiation lens according to claim 5 , wherein another portion of the plurality of first patterns and the plurality of second patterns is arranged adjacent to the at least the portion of the plurality of first patterns and the plurality of second patterns and arranged, in at least one of the first direction and the second direction, with another gap larger than the gap, interposed therebetween.

13 . The thermal radiation lens according to claim 4 , wherein another portion of the plurality of first patterns and the plurality of second patterns is disposed adjacent to the at least the portion of the plurality of first patterns and the plurality of second patterns and has another width different from the width for at least one of the first direction and the second direction.

14 . The thermal radiation lens according to claim 5 , wherein another portion of the plurality of first patterns and the plurality of second patterns is disposed adjacent to the at least the portion of the plurality of first patterns and the plurality of second patterns and has another width different from the width for at least one of the first direction and the second direction.

15 . The thermal radiation lens according to claim 6 , wherein another portion of the plurality of first patterns and the plurality of second patterns is disposed adjacent to the at least the portion of the plurality of first patterns and the plurality of second patterns and has another width different from the width for at least one of the first direction and the second direction.

16 . The thermal radiation lens according to claim 4 , wherein the first region including the plurality of first patterns and the second region including the plurality of second patterns are arranged periodically in at least one axis direction parallel to the one surface.

17 . The thermal radiation lens according to claim 5 , wherein the first region including the plurality of first patterns and the second region including the plurality of second patterns are arranged periodically in at least one axis direction parallel to the one surface.

18 . The thermal radiation lens according to claim 4 , wherein the substrate is a heat-tolerant dielectric film, and the plurality of first patterns and the plurality of second patterns are conductive metal films.

19 . The thermal radiation lens according to claim 5 , wherein the substrate is a heat-tolerant dielectric film, and the plurality of first patterns and the plurality of second patterns are conductive metal films.

20 . The thermal radiation lens according to claim 10 , wherein the plurality of first patterns and the plurality of second patterns are formed of gold, silver, copper, or aluminum.

Assignees

• National Univ Corporation Tokyo Univ Of Agriculture And Technology

Inventors

• Suzuki Takehito

Classifications

• G02B13/14 Primary

  for use with infrared or ultraviolet radiation ({G02B13/008, } G02B13/16 take precedence) · CPC title

• G02B1/002

  made of materials engineered to provide properties not available in nature, e.g. metamaterials · CPC title

• G02B1/02

  made of crystals, e.g. rock-salt, semi-conductors (G02B1/08 takes precedence) · CPC title

• G02B3/00

  Simple or compound lenses · CPC title