# Thermal radiation enhancement by thermal extraction of silicon micropyramids

https://mdr.nims.go.jp/datasets/3ad85080-81a3-4a9b-b0e3-d7c3dd6ded87

## File

- [Poster_5_完成(暫定)_si.pptx](https://mdr.nims.go.jp/filesets/512bfbf8-0baa-45e8-8ab6-92ad4f36dba5/download) ([Detail](https://mdr.nims.go.jp/filesets/512bfbf8-0baa-45e8-8ab6-92ad4f36dba5.md))

## Id

3ad85080-81a3-4a9b-b0e3-d7c3dd6ded87

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-02T05:58:03.045457Z

## Updated at

2024-11-06T07:30:47.045822Z

## Published at

2024-11-06T07:30:47.111967Z

## Doi

https://doi.org/10.48505/nims.4924

## First published url

https://www.nims.go.jp/mana/2024/abstract/nm-17_ryugo_hosokawa.html

## Date published



## Recorded date published



## Resource type

conference_poster

## Manuscript type

na

## Collection



## Title

- title: Thermal radiation enhancement by thermal extraction of silicon micropyramids
  title_type: original
  lang: en

## Description

- description: "The refractive index of a thermal radiation medium plays a role in
    the magnitude of heat flux. However, the refractive index is often omitted because
    those of air and vacuum are unity. Here we investigated whether silicon (Si) micropyramids,
    which has a high refractive index in the mid-infrared region, can be used as thermal
    extractors into vacuum. The purpose of introducing micropyramids is to reduce
    total internal refraction, where a hemisphere dome was used previously whose height
    increases with increasing area.\r\nWe numerically simulated the thermal extraction
    enhancement of Si micropyramids into vacuum. The result shows that Si micropyramids
    can enhance thermal extraction by 64.6% with the optimized pyramid width. In experiments,
    micro-sized pyramids were fabricated by wet etching a 500 µm thick Si substrate,
    and the thermal extraction was evaluated by a heat flux sensor in vacuum. The
    measured heat flux of the Si micropyramids was greater than that of the planar
    Si substrate or without Si substrate. These numerical and experimental results
    indicate that the Si micropyramids can enhance thermal radiation by thermal extraction
    despite their reduced thickness. "
  description_type: abstract
  lang: eng

## Creator

- name: Ryugo Hosokawa
  role: author
  orcid: https://orcid.org/0009-0001-7579-4752
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Nanomaterials
    Field/Optical Nanostructure Team
  ror: https://ror.org/026v1ze26
- name: Etsuko Shimada
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Nanomaterials
    Field/Optical Nanostructure Team
  ror: https://ror.org/026v1ze26
- name: Chia-Hung Wu
  role: author
- name: Satoshi Ishii
  role: author
  orcid: https://orcid.org/0000-0003-0731-8428
  organization: National Institute for Materials Science
  department: Research Center for Materials Nanoarchitectonics (MANA)/Nanomaterials
    Field/Optical Nanostructure Team
  ror: https://ror.org/026v1ze26

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## Keyword

- subject: Thermal radiation
  schema: not_defined
- subject: Microstructure
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: Joint workshop LANL/NIMS Quantum and Functional Materials and MANA International
  Symposium 2024
start_date: 2024-10-15
end_date: 2024-10-17
identifier: https://www.nims.go.jp/mana/news_room/conference/2024102501.html

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## Fileset

- id: 512bfbf8-0baa-45e8-8ab6-92ad4f36dba5
  filename: Poster_5_完成(暫定)_si.pptx
  content_type: application/vnd.openxmlformats-officedocument.presentationml.presentation
  size: 14951937
  md5: 243e2c75514f6c5ed2ae184a8fdee47e

## Thumbnail

fileset_id: 512bfbf8-0baa-45e8-8ab6-92ad4f36dba5
filename: Poster_5_完成(暫定)_si.pptx