研究目的
To develop a stretchable and high-adhesive plasmonic metasheet using an Al subwavelength grating embedded in an elastomer nanosheet for dynamic color tuning applications.
研究成果
The study successfully developed a stretchable ultra-thin elastomeric plasmonic metasheet (UTEPM) that demonstrates dynamic color tuning (DCT) by stretching the elastomer nanosheet. The UTEPM can be driven with two to three orders of magnitude less force than previously reported plasmonic metasurfaces, making it suitable for integration into microdevices. The results suggest potential applications in strain visualization, tunable hyperspectral filters, and high-resolution or electronic skin displays.
研究不足
The study mentions that the fabrication deviation increased as the grating period decreased, with a maximum deviation of 6.7% for the blue filter, related to the accuracy of the FIB. Additionally, the chromatic value gradually decreases as the grating period increases over 450 nm, due to the increase of leaked light.
1：Experimental Design and Method Selection:
The study involved the fabrication of an Al metasurface embedded in an elastomer nanosheet using a sacrificial release method with a polyvinyl alcohol sacrificial layer. The design rationale was based on controlling the displacement of periodic nanostructures to achieve dynamic color tuning.
2：Sample Selection and Data Sources:
The samples were fabricated with an Al subwavelength grating array embedded in an elastomer nanosheet. The grating periods were designed to range from 300 to 600 nm.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (SEM), optical microscope (BX51WI, Olympus Corp.), xenon lamp (MAX-350, 300W, ASAHI SPECTRA Co., Ltd.), and a spectrometer (USB4000, Ocean Insights Ltd.). Materials included polyvinyl alcohol (PVA) sacrificial layer, polystyrene–polybutadiene–polystyrene (SBS) triblock copolymer, and aluminum (Al).
4：Experimental Procedures and Operational Workflow:
The fabrication process involved spin-coating a PVA sacrificial layer onto a Si wafer, adhering an SBS nanosheet, depositing an Al layer, milling a nanograting shape by focused ion beam (FIB), laminating a second SBS nanosheet, and dissolving the PVA sacrificial layer to release the freestanding metasheet.
5：Data Analysis Methods:
Transmission spectra were measured using an optical microscope and spectrometer. The spectra were analyzed using rigorous coupled-wave analysis (RCWA) to investigate the mechanism of light transmission based on surface plasmons.
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optical microscope
BX51WI
Olympus Corp.
Used for measuring the transmission of light by multicolor pixel series.
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charge-coupled device camera
DP22
Olympus Corp.
Used for acquiring microscopic images of transmitted light.
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objective lens
SLMPN, 20×, NA: 0.25
Olympus Corp.
Used for optical measurements with a low numerical aperture.
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motorized travel stages
MTS25/M-Z8E
Thorlabs Inc.
Used for applying strain to the UTEPM for DCT characteristics measurement.
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xenon lamp
MAX-350, 300W
ASAHI SPECTRA Co., Ltd.
Light source for optical measurements.
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spectrometer
USB4000
Ocean Insights Ltd.
Used for acquiring spectra of transmitted light.
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