Wide-spectral absorption of femtosecond laser textured germanium

Xiaolong Liu; Julius Halmela

Wide-spectral absorption of femtosecond laser textured germanium

Aalto University

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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Abstract

This work focuses on addressing limitations in the optical properties of germanium (Ge), especially concerning reflections from the planar surface and for sub-bandgap wavelengths (>1.7 µm). To overcome these challenges, femtosecond laser processing is employed. The study explores the impact of fs-laser texturing on crystalline Ge wafers, highlighting the potential benefits of induced surface micro- and nanostructures in improving optical absorption. The experiment involves varying laser power and scan speed, and the results show a significant enhancement in absorptance in a wide spectral range of 0.25 – 2.5 µm. The obtained high absorptance outperforms fs-laser textured silicon at wavelengths exceeding 1 µm, suggesting promising applications for fs-laser-textured Ge in infrared optical and optoelectronic technologies.

Original language	English
Title of host publication	Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024)
Editors	Sergey Y. Yurish
Publisher	Omakustanteet Ephemeral Publishers
Pages	56-57
Number of pages	2
ISBN (Electronic)	978-84-09-61372-4
Publication status	Published - 2024
MoE publication type	A4 Conference publication
Event	International Conference on Optics, Photonics and Lasers - Melia Palma Marina, Palma de Mallorca (Balearic Islands), Spain Duration: 15 May 2024 → 17 May 2024 Conference number: 7 https://opal-conference.com/

Conference

Conference	International Conference on Optics, Photonics and Lasers
Abbreviated title	OPAL
Country/Territory	Spain
City	Palma de Mallorca (Balearic Islands)
Period	15/05/2024 → 17/05/2024
Internet address	https://opal-conference.com/

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022_Paper for OPAL'2024Accepted author manuscript, 582 KBLicence: Unspecified

Cite this

@inproceedings{afc7efd469b34871898497151070f996,

title = "Wide-spectral absorption of femtosecond laser textured germanium",

abstract = "This work focuses on addressing limitations in the optical properties of germanium (Ge), especially concerning reflections from the planar surface and for sub-bandgap wavelengths (>1.7 µm). To overcome these challenges, femtosecond laser processing is employed. The study explores the impact of fs-laser texturing on crystalline Ge wafers, highlighting the potential benefits of induced surface micro- and nanostructures in improving optical absorption. The experiment involves varying laser power and scan speed, and the results show a significant enhancement in absorptance in a wide spectral range of 0.25 – 2.5 µm. The obtained high absorptance outperforms fs-laser textured silicon at wavelengths exceeding 1 µm, suggesting promising applications for fs-laser-textured Ge in infrared optical and optoelectronic technologies.",

author = "Xiaolong Liu and Julius Halmela",

year = "2024",

language = "English",

pages = "56--57",

editor = "Yurish, {Sergey Y. }",

booktitle = "Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024)",

publisher = "Omakustanteet Ephemeral Publishers",

address = "Finland",

note = "International Conference on Optics, Photonics and Lasers, OPAL ; Conference date: 15-05-2024 Through 17-05-2024",

url = "https://opal-conference.com/",

}

Liu, X & Halmela, J 2024, Wide-spectral absorption of femtosecond laser textured germanium. in SY Yurish (ed.), Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024)., 022, Omakustanteet Ephemeral Publishers, pp. 56-57, International Conference on Optics, Photonics and Lasers, Palma de Mallorca (Balearic Islands), Spain, 15/05/2024.

Wide-spectral absorption of femtosecond laser textured germanium. / Liu, Xiaolong; Halmela, Julius.
Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024). ed. / Sergey Y. Yurish. Omakustanteet Ephemeral Publishers, 2024. p. 56-57 022.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Wide-spectral absorption of femtosecond laser textured germanium

AU - Liu, Xiaolong

AU - Halmela, Julius

N1 - Conference code: 7

PY - 2024

Y1 - 2024

N2 - This work focuses on addressing limitations in the optical properties of germanium (Ge), especially concerning reflections from the planar surface and for sub-bandgap wavelengths (>1.7 µm). To overcome these challenges, femtosecond laser processing is employed. The study explores the impact of fs-laser texturing on crystalline Ge wafers, highlighting the potential benefits of induced surface micro- and nanostructures in improving optical absorption. The experiment involves varying laser power and scan speed, and the results show a significant enhancement in absorptance in a wide spectral range of 0.25 – 2.5 µm. The obtained high absorptance outperforms fs-laser textured silicon at wavelengths exceeding 1 µm, suggesting promising applications for fs-laser-textured Ge in infrared optical and optoelectronic technologies.

AB - This work focuses on addressing limitations in the optical properties of germanium (Ge), especially concerning reflections from the planar surface and for sub-bandgap wavelengths (>1.7 µm). To overcome these challenges, femtosecond laser processing is employed. The study explores the impact of fs-laser texturing on crystalline Ge wafers, highlighting the potential benefits of induced surface micro- and nanostructures in improving optical absorption. The experiment involves varying laser power and scan speed, and the results show a significant enhancement in absorptance in a wide spectral range of 0.25 – 2.5 µm. The obtained high absorptance outperforms fs-laser textured silicon at wavelengths exceeding 1 µm, suggesting promising applications for fs-laser-textured Ge in infrared optical and optoelectronic technologies.

UR - https://sensorsportal.com/OPAL_2024/OPAL_2024_Proceedings.pdf

M3 - Conference article in proceedings

SP - 56

EP - 57

BT - Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024)

A2 - Yurish, Sergey Y.

PB - Omakustanteet Ephemeral Publishers

T2 - International Conference on Optics, Photonics and Lasers

Y2 - 15 May 2024 through 17 May 2024

ER -

Wide-spectral absorption of femtosecond laser textured germanium

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