TY - JOUR
T1 - Femtosecond Laser-Induced Vanadium Oxide Metamaterial Nanostructures and the Study of Optical Response by Experiments and Numerical Simulations
AU - Bhupathi, Saranya
AU - Wang, Shancheng
AU - Abutoama, Mohammad
AU - Balin, Igal
AU - Wang, Lei
AU - Kazansky, Peter G.
AU - Long, Yi
AU - Abdulhalim, Ibrahim
N1 - Publisher Copyright:
© 2020 American Chemical Society.
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.
PY - 2020/9/16
Y1 - 2020/9/16
N2 - 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.
AB - 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.
KW - vanadium dioxide
KW - smart window
KW - thermochromic materials
KW - laser-induced periodic surface structures
KW - patterned nanostructure
UR - http://www.scopus.com/inward/record.url?scp=85091191729&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c03844
DO - 10.1021/acsami.0c03844
M3 - Journal article
C2 - 32838521
AN - SCOPUS:85091191729
SN - 1944-8244
VL - 12
SP - 41905
EP - 41918
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 37
ER -