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Femtosecond laser-induced vanadium oxide metamaterial nanostructures and the study of optical response by experiments and numerical simulations

Femtosecond laser-induced vanadium oxide metamaterial nanostructures and the study of optical response by experiments and numerical simulations
Femtosecond laser-induced vanadium oxide metamaterial nanostructures and the study of optical response by experiments and numerical simulations

Surface patterning is a popular approach to produce photonic metasurfaces that are tunable when electro-optic, thermo-optic, or magneto-optic materials are used. Vanadium oxides (VyOx) are well-known phase change materials with many applications, especially when used as tunable metamaterial photonic structures. Particularly, VO2 is a well-known thermochromic material for its near-room-temperature phase transition from the insulating to the metallic state. One-dimensional (1D) VO2 nanograting structures are studied by numerical simulation, and the simulation results reveal that the VO2 nanograting structures could enhance the luminous transmittance (Tlum) compared with a pristine flat VO2 surface. It is worth mentioning that Tlum is also polarization-dependent, and both larger grating height and smaller grating periodicity give enhanced Tlum, particularly at TE polarization in both insulating (20 °C) and metallic (90 °C) states of VO2. Femtosecond laser-patterned VO2 films exhibiting nanograting structures with an average periodicity of ≈500-700 nm have been fabricated for the first time to enhance thermochromic properties. Using X-ray photoelectron spectroscopy, it is shown that at the optimum laser processing conditions, VO2 dominates the film composition, while under extra processing, the existence of other vanadium oxide phases such as V2O3 and V2O5 increases. Such structures show enhanced transmittance in the near-infrared (NIR) region, with an improvement in NIR and solar modulation abilities (ΔTNIR = 10.8%, ΔTsol = 10.9%) compared with a flat VO2 thin film (ΔTNIR = 8%, ΔTsol = 10.2%). The slight reduction in transmittance in the visible region is potentially due to the scattering caused by the imperfect nanograting structures. This new patterning approach helps understand the polarization-dependent optical response of VO2 thin films and opens a new gateway for smart devices.

laser-induced periodic surface structures, patterned nanostructure, smart window, thermochromic materials, vanadium dioxide
1944-8244
41905-41918
Bhupathi, Saranya
6258b926-e7cd-4446-b728-9eeebdf32329
Wang, Shancheng
d268791c-ea6b-4749-9579-ff6a9ae0c96c
Abutoama, Mohammad
7ddcc981-4bc2-4855-9b7a-54fae77c81f8
Balin, Igal
7799898b-971b-4c42-aa86-6f00a99edf0c
Wang, Lei
c58bd3ee-ad0c-4829-9365-ef13fad13361
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Long, Yi
a9e8acb0-7077-4413-943e-4e8e72091f46
Abdulhalim, Ibrahim
a3e64136-bc63-4409-964c-e292b8dad3fa
Bhupathi, Saranya
6258b926-e7cd-4446-b728-9eeebdf32329
Wang, Shancheng
d268791c-ea6b-4749-9579-ff6a9ae0c96c
Abutoama, Mohammad
7ddcc981-4bc2-4855-9b7a-54fae77c81f8
Balin, Igal
7799898b-971b-4c42-aa86-6f00a99edf0c
Wang, Lei
c58bd3ee-ad0c-4829-9365-ef13fad13361
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Long, Yi
a9e8acb0-7077-4413-943e-4e8e72091f46
Abdulhalim, Ibrahim
a3e64136-bc63-4409-964c-e292b8dad3fa

Bhupathi, Saranya, Wang, Shancheng, Abutoama, Mohammad, Balin, Igal, Wang, Lei, Kazansky, Peter G., Long, Yi and Abdulhalim, Ibrahim (2020) Femtosecond laser-induced vanadium oxide metamaterial nanostructures and the study of optical response by experiments and numerical simulations. ACS Applied Materials and Interfaces, 12 (37), 41905-41918. (doi:10.1021/acsami.0c03844).

Record type: Article

Abstract

Surface patterning is a popular approach to produce photonic metasurfaces that are tunable when electro-optic, thermo-optic, or magneto-optic materials are used. Vanadium oxides (VyOx) are well-known phase change materials with many applications, especially when used as tunable metamaterial photonic structures. Particularly, VO2 is a well-known thermochromic material for its near-room-temperature phase transition from the insulating to the metallic state. One-dimensional (1D) VO2 nanograting structures are studied by numerical simulation, and the simulation results reveal that the VO2 nanograting structures could enhance the luminous transmittance (Tlum) compared with a pristine flat VO2 surface. It is worth mentioning that Tlum is also polarization-dependent, and both larger grating height and smaller grating periodicity give enhanced Tlum, particularly at TE polarization in both insulating (20 °C) and metallic (90 °C) states of VO2. Femtosecond laser-patterned VO2 films exhibiting nanograting structures with an average periodicity of ≈500-700 nm have been fabricated for the first time to enhance thermochromic properties. Using X-ray photoelectron spectroscopy, it is shown that at the optimum laser processing conditions, VO2 dominates the film composition, while under extra processing, the existence of other vanadium oxide phases such as V2O3 and V2O5 increases. Such structures show enhanced transmittance in the near-infrared (NIR) region, with an improvement in NIR and solar modulation abilities (ΔTNIR = 10.8%, ΔTsol = 10.9%) compared with a flat VO2 thin film (ΔTNIR = 8%, ΔTsol = 10.2%). The slight reduction in transmittance in the visible region is potentially due to the scattering caused by the imperfect nanograting structures. This new patterning approach helps understand the polarization-dependent optical response of VO2 thin films and opens a new gateway for smart devices.

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More information

Accepted/In Press date: 25 August 2020
e-pub ahead of print date: 25 August 2020
Published date: 16 September 2020
Additional Information: Funding Information: This research was supported by grants from the National Research Foundation, Prime Minister’s Office, Singapore, under its Campus of Research Excellence and Technological Enterprise (CREATE) program. SEM, AFM, and optical characterizations were performed at the Nanomaterials Characterization Laboratory and Optical Laboratory at CREATE. XPS study was carried out at the Facility for Analysis Characterization Testing & Simulation (FACTS), NTU. The support of the Israel Ministry of Science, Technology and Space as well as the Ministry of Energy is highly appreciated.
Keywords: laser-induced periodic surface structures, patterned nanostructure, smart window, thermochromic materials, vanadium dioxide

Identifiers

Local EPrints ID: 481411
URI: http://eprints.soton.ac.uk/id/eprint/481411
ISSN: 1944-8244
PURE UUID: e2962715-ddcf-422c-b57b-96cdaf7213e3

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Date deposited: 25 Aug 2023 16:56
Last modified: 05 Jun 2024 19:27

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Contributors

Author: Saranya Bhupathi
Author: Shancheng Wang
Author: Mohammad Abutoama
Author: Igal Balin
Author: Lei Wang
Author: Yi Long
Author: Ibrahim Abdulhalim

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