Detailed Analysis of Peripheral Reflection from a Photonic Ball
Colloidal crystals with spherical shapes are called photonic balls, and their optical properties have been extensively studied because they can be applied as structurally colored pigments or colorimetric sensors. When a colloidal crystal consists of small colloidal particles, e.g., 250 nm in diamete...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2021-12-01
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| Series: | Advanced Photonics Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/adpr.202100131 |
| _version_ | 1818742655672123392 |
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| author | Ryosuke Ohnuki Miki Sakai Yukikazu Takeoka Shinya Yoshioka |
| author_facet | Ryosuke Ohnuki Miki Sakai Yukikazu Takeoka Shinya Yoshioka |
| author_sort | Ryosuke Ohnuki |
| collection | DOAJ |
| description | Colloidal crystals with spherical shapes are called photonic balls, and their optical properties have been extensively studied because they can be applied as structurally colored pigments or colorimetric sensors. When a colloidal crystal consists of small colloidal particles, e.g., 250 nm in diameter, the (111) crystal planes of the face‐centered cubic lattice cause Bragg reflection, resulting in a brilliant structural color. However, in colloidal crystals that consist of larger particles, e.g., 400 nm in diameter, different crystal planes may be involved in the coloration; the (220) planes cause ring‐like iridescent reflection in the peripheral part of the spherical crystal. Herein, a detailed optical analysis of this peripheral reflection is presented. The photonic ball consists of many small crystal domains, and the reflecting crystal planes are oriented in different directions from one domain to another. Thus, in some domains, significantly tilted planes and refraction at the spherical surface cause reflection in a highly oblique direction, such that the reflection path requires a 3D description. This study shows that such an oblique reflection significantly affects the appearance of the photonic ball. |
| first_indexed | 2024-12-18T02:15:58Z |
| format | Article |
| id | doaj.art-7502762849de4189a49f310f0e58f2b2 |
| institution | Directory Open Access Journal |
| issn | 2699-9293 |
| language | English |
| last_indexed | 2024-12-18T02:15:58Z |
| publishDate | 2021-12-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Photonics Research |
| spelling | doaj.art-7502762849de4189a49f310f0e58f2b22022-12-21T21:24:23ZengWiley-VCHAdvanced Photonics Research2699-92932021-12-01212n/an/a10.1002/adpr.202100131Detailed Analysis of Peripheral Reflection from a Photonic BallRyosuke Ohnuki0Miki Sakai1Yukikazu Takeoka2Shinya Yoshioka3Graduate School of Science and Technology Tokyo University of Science Yamazaki Noda 278-8510 JapanGraduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 JapanGraduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 JapanGraduate School of Science and Technology Tokyo University of Science Yamazaki Noda 278-8510 JapanColloidal crystals with spherical shapes are called photonic balls, and their optical properties have been extensively studied because they can be applied as structurally colored pigments or colorimetric sensors. When a colloidal crystal consists of small colloidal particles, e.g., 250 nm in diameter, the (111) crystal planes of the face‐centered cubic lattice cause Bragg reflection, resulting in a brilliant structural color. However, in colloidal crystals that consist of larger particles, e.g., 400 nm in diameter, different crystal planes may be involved in the coloration; the (220) planes cause ring‐like iridescent reflection in the peripheral part of the spherical crystal. Herein, a detailed optical analysis of this peripheral reflection is presented. The photonic ball consists of many small crystal domains, and the reflecting crystal planes are oriented in different directions from one domain to another. Thus, in some domains, significantly tilted planes and refraction at the spherical surface cause reflection in a highly oblique direction, such that the reflection path requires a 3D description. This study shows that such an oblique reflection significantly affects the appearance of the photonic ball.https://doi.org/10.1002/adpr.202100131colloidal crystalsnumerical aperture dependenceoptical analysisphotonic ballspigmentsstructural colors |
| spellingShingle | Ryosuke Ohnuki Miki Sakai Yukikazu Takeoka Shinya Yoshioka Detailed Analysis of Peripheral Reflection from a Photonic Ball Advanced Photonics Research colloidal crystals numerical aperture dependence optical analysis photonic balls pigments structural colors |
| title | Detailed Analysis of Peripheral Reflection from a Photonic Ball |
| title_full | Detailed Analysis of Peripheral Reflection from a Photonic Ball |
| title_fullStr | Detailed Analysis of Peripheral Reflection from a Photonic Ball |
| title_full_unstemmed | Detailed Analysis of Peripheral Reflection from a Photonic Ball |
| title_short | Detailed Analysis of Peripheral Reflection from a Photonic Ball |
| title_sort | detailed analysis of peripheral reflection from a photonic ball |
| topic | colloidal crystals numerical aperture dependence optical analysis photonic balls pigments structural colors |
| url | https://doi.org/10.1002/adpr.202100131 |
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