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- Title
Scaling up multispectral color filters with binary lithography and reflow (BLR).
- Authors
Rahman, Md Abdur; Rezaei, Soroosh Daqiqeh; Arora, Deepshikha; Wang, Hao; Mori, Tomohiro; Chia, Ser Chern; Chan, John You En; Nair, Parvathi Nair Suseela; Uddin, Siam; Pan, Cheng-Feng; Zhang, Wang; Wang, Hongtao; Ruitao, Zheng; Heng, Lim Sin; Yang, Joel K. W.
- Abstract
Efforts to increase the number of filters are driven by the demand for miniaturized spectrometers and multispectral imaging. However, processes that rely on sequential fabrication of each filter are cost ineffective. Herein, we introduce an approach to produce at least 16 distinct filters based on a single low-resolution lithographic step with minimum feature size of 0.6 μm. Distinct from grayscale lithography, we employ standard binary lithography but achieve height variations in polymeric resist through a post-development reflow process. The resulting transparent polymeric films were incorporated in Fabry–Perot cavity structures with cavity thickness ranging from 90 to 230 nm to produce transmittance across the visible spectrum. This binary lithography and reflow (BLR) process demonstrates control of the dielectric layer thickness down to ∼15 nm. This new process provides a cost-effective alternative to traditional techniques in fabricating microscopic transmission filters, and other applications where precise thickness variation across the substrate is required.
- Subjects
ELECTRON beam lithography; LIGHT filters; STRUCTURAL colors; VISIBLE spectra; GRAYSCALE model
- Publication
Nanophotonics (21928606), 2024, Vol 13, Issue 19, p3671
- ISSN
2192-8606
- Publication type
Article
- DOI
10.1515/nanoph-2024-0090