Photonic Crystal Flakes
Open accessAbstract
Photonic crystals (PCs) have been traditionally produced on rigid substrates. Here, we report the development of free-standing one-dimensional (1D) slanted PC flakes. A single pulse of a 5 ns Nd:YAG laser (λ = 532 nm, 350 mJ) was used to organize silver nanoparticles (10–50 nm) into multilayer gratings embedded in ∼10 μm poly(2-hydroxyethyl methacrylate- co -methacrylic acid) hydrogel films. The 1D PC flakes had narrow-band diffraction peak at ∼510 nm. Ionization of the carboxylic acid groups in the hydrogel produced Donnan osmotic pressure and modulated the Bragg peak. In response to pH (4–7), the PC flakes shifted their diffraction wavelength from 500 to 620 nm, exhibiting 0.1 pH unit sensitivity. The color changes were visible to the eye in the entire visible spectrum. The optical characteristics of the 1D PC flakes were also analyzed by finite element method simulations. Free-standing PC flakes may have application in spray deposition of functional materials.
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Word, bit, and source lines allowed interconnecting 1T-1M RRAM unit cells in an 8 × 8 NOR-type array to achieve independent cell control.
“Word, bit, and source lines allowed interconnecting the 1T–1M RRAM unit cells in the 8 × 8 NOR‐type array to achieve independent cell control.”
From Wearables in Medicine (2018) · cites this paper as [94]
Flexible NOR type resistive random-access memories with a one transistor-one memristor (1T-1M) structure have been developed.
“Flexible NOR type resistive random‐access memories having one transistor–one memristor (1T–1M) structure have been developed.94”
From Wearables in Medicine (2018) · cites this paper as [94]
These memory cells were created by integrating single crystal silicon transistors with an amorphous α-TiO2 memristor on a flexible substrate.
“These memory cells were created by integrating single crystal silicon transistors with an amorphous α‐TiO2 memristor on a flexible substrate.”
From Wearables in Medicine (2018) · cites this paper as [94]
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Two-Dimensional Photonic Crystal Chemical and Biomolecular Sensors
Cai, Z., Smith, N. L., Zhang, J.-T., & Asher, S. A. (2015) · Analytical Chemistry · doi:10.1021/ac504679n · Cited by 216 · see citing works
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Yetisen, A. K., Martinez‐Hurtado, J. L., Ünal, B., Khademhosseini, A., & Butt, H. (2018) · Advanced Materials · doi:10.1002/adma.201706910 · Cited by 569 · see citing works
Self-citationMaterials with Tunable Optical Properties for Wearable Epidermal Sensing in Health Monitoring
Han, F., Wang, T., Liu, G., Liu, H., Xie, X., Wei, Z., Li, J., Jiang, C., He, Y., & Xu, F. (2022) · Advanced Materials · doi:10.1002/adma.202109055 · Cited by 250 · see citing works
- Authors
- Yetisen, A. K., Butt, H., & Yun, S.-H.
- Affiliations
- Harvard University (US)
- University of Birmingham (GB)
- Corresponding author
- Yetisen, Ali K.
- Yun, Seok-Hyun
- Venue
- ACS Sensors
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-03-10
- Volume
- 1
- Issue
- 5
- Pages
- 493-497
- ISSN
- 2379-3694 (ISSN-L)
- OpenAlex
- W2296624501
- Cited by
- 41
- References
- 1
- Citations by year
- 2025: 3 · 2024: 6 · 2023: 5 · 2022: 5 · 2021: 6 · 2020: 5 · 2019: 3 · 2018: 3 · 2017: 2 · 2016: 3
- FWCI
- 1.73
- Type
- journal article
- Language
- en
- Open access
- Licence
- other-oa
- Locations
- ACS Sensors (publishedVersion)
- University of Birmingham Research Portal (University of Birmingham) (submittedVersion, other-oa)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photonic Crystals and Applications
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Gold and Silver Nanoparticles Synthesis and Applications
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › Optical Coatings and Gratings
- Keywords
- photonic crystals, one-dimensional photonic crystals, silver nanoparticles, multilayer gratings, hydrogel films, pH sensing, colorimetric sensing, spray deposition
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