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Large-scale fabrication of achiral plasmonic metamaterials with giant chiroptical response

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ABSTRACT

A variety of extrinsic chiral metamaterials were fabricated by a combination of self-ordering anodic oxidation of aluminum foil, nanoimprint lithography and glancing angle deposition. All of these techniques are scalable and pose a significant improvement to standard metamaterial fabrication techniques. Different interpore distances and glancing angle depositions enable the plasmonic resonance wavelength to be tunable in the range from UVA to IR. These extrinsic chiral metamaterials only exhibit significant chiroptical response at non-normal angles of incidence. This intrinsic property enables the probing of both enantoimeric structures on the same sample, by inverting the tilt of the sample relative to the normal angle. In biosensor applications this allows for more precise, cheap and commercialized devices. As a proof of concept two different molecules were used to probe the sensitivity of the metamaterials. These proved the applicability to sense proteins through non-specific adsorption on the metamaterial surface or through functionalized surfaces to increase the sensing sensitivity. Besides increasing the sensing sensitivity, these metamaterials may also be commercialized and find applications in surface-enhanced IR spectroscopy, terahertz generation and terahertz circular dichroism spectroscopy.

No MeSH data available.


CD response from the ECM fabricated with 430 nm interpore distance and 50° glancing angle deposition with different angle orientation and measured with and without cytochrome c adsorbed on the surface.
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Figure 12: CD response from the ECM fabricated with 430 nm interpore distance and 50° glancing angle deposition with different angle orientation and measured with and without cytochrome c adsorbed on the surface.

Mentions: A similar plasmonic resonance shift of the resonance mode around 770 nm upon adsorption of cytochrome c was observed at different θ angles (Fig. 12 and Table 2). This indicates that the sensitivity of the plasmonic resonance towards changes in the local refractive index near the ECM surface is not effected by the θ angle. Only the resonance mode around 770 nm was used in this analysis as the resonances of the other modes are altered as described above and as a result are incomparable.


Large-scale fabrication of achiral plasmonic metamaterials with giant chiroptical response
CD response from the ECM fabricated with 430 nm interpore distance and 50° glancing angle deposition with different angle orientation and measured with and without cytochrome c adsorbed on the surface.
© Copyright Policy - Beilstein
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4979657&req=5

Figure 12: CD response from the ECM fabricated with 430 nm interpore distance and 50° glancing angle deposition with different angle orientation and measured with and without cytochrome c adsorbed on the surface.
Mentions: A similar plasmonic resonance shift of the resonance mode around 770 nm upon adsorption of cytochrome c was observed at different θ angles (Fig. 12 and Table 2). This indicates that the sensitivity of the plasmonic resonance towards changes in the local refractive index near the ECM surface is not effected by the θ angle. Only the resonance mode around 770 nm was used in this analysis as the resonances of the other modes are altered as described above and as a result are incomparable.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

A variety of extrinsic chiral metamaterials were fabricated by a combination of self-ordering anodic oxidation of aluminum foil, nanoimprint lithography and glancing angle deposition. All of these techniques are scalable and pose a significant improvement to standard metamaterial fabrication techniques. Different interpore distances and glancing angle depositions enable the plasmonic resonance wavelength to be tunable in the range from UVA to IR. These extrinsic chiral metamaterials only exhibit significant chiroptical response at non-normal angles of incidence. This intrinsic property enables the probing of both enantoimeric structures on the same sample, by inverting the tilt of the sample relative to the normal angle. In biosensor applications this allows for more precise, cheap and commercialized devices. As a proof of concept two different molecules were used to probe the sensitivity of the metamaterials. These proved the applicability to sense proteins through non-specific adsorption on the metamaterial surface or through functionalized surfaces to increase the sensing sensitivity. Besides increasing the sensing sensitivity, these metamaterials may also be commercialized and find applications in surface-enhanced IR spectroscopy, terahertz generation and terahertz circular dichroism spectroscopy.

No MeSH data available.