Abstract
Vanadium dioxide (VO2) emerges as an attractive plasmonic material due to its unique reversible thermal-responsive phase transition and the promising application in energy-saving smart windows. Here, by optimizing the geometry of VO2 nano-cylinder arrays, we demonstrate a significant performance enhancement for energy-efficient thermochromic windows. Such a performance enhancement relies on the on-off behavior of plasmonic resonance in the extremely high packing density of VO2 nano-cylinder arrays. Different from the typical plasmonic material, silver, VO2 nano-cylinders are characterized to have strong absorbance in near-infrared spectrum with significantly weaker plasmonic coupling to their neighbors, making them suitable to be arranged with a high packing density. The VO2 nano-cylinder arrays exhibit a 160% luminous transmittance increment, comparing to a flat film with the same solar modulation of ∼10%. The work provides a better understanding of the plasmonic behavior on phase-change VO2 and an efficient method to enhance smart window performance.
| Original language | English |
|---|---|
| Pages (from-to) | 9324-9331 |
| Number of pages | 8 |
| Journal | Optics Express |
| Volume | 29 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 15 Mar 2021 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Funding
Y. Long thanks to the funding support by the National Research Foundation, Prime Minister’s Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme; Minister of Education Singapore Tier 1 RG86/20 and RG103/19; Singapore International Joint Research Institute.