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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 a bare ECM and with a molecule adsorbed on the surface. (a) CD response with and without cytochrome c adsorbed on the ECM surface. (b) CD response with and without Cysteamine adsorbed on the ECM surface. All measurements were recorded with an ECM orientation of θ = 12°;  = 0° or θ = −12°;  = 0°.
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Figure 11: CD response from a bare ECM and with a molecule adsorbed on the surface. (a) CD response with and without cytochrome c adsorbed on the ECM surface. (b) CD response with and without Cysteamine adsorbed on the ECM surface. All measurements were recorded with an ECM orientation of θ = 12°; = 0° or θ = −12°; = 0°.

Mentions: In all experiments the ECM fabricated with 430 nm interpore distance and a glancing deposition angle of 50° was used as it displays a well-defined response at ca. 770 nm compared to the other structures, together with two minor distinct peaks at ca. 440 nm and ca. 330 nm. The resulting spectra are presented in Fig. 11 and the corresponding shifts compared to the bare structure are summarized in Table 1.


Large-scale fabrication of achiral plasmonic metamaterials with giant chiroptical response
CD response from a bare ECM and with a molecule adsorbed on the surface. (a) CD response with and without cytochrome c adsorbed on the ECM surface. (b) CD response with and without Cysteamine adsorbed on the ECM surface. All measurements were recorded with an ECM orientation of θ = 12°;  = 0° or θ = −12°;  = 0°.
© Copyright Policy - Beilstein
Related In: Results  -  Collection

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

Figure 11: CD response from a bare ECM and with a molecule adsorbed on the surface. (a) CD response with and without cytochrome c adsorbed on the ECM surface. (b) CD response with and without Cysteamine adsorbed on the ECM surface. All measurements were recorded with an ECM orientation of θ = 12°; = 0° or θ = −12°; = 0°.
Mentions: In all experiments the ECM fabricated with 430 nm interpore distance and a glancing deposition angle of 50° was used as it displays a well-defined response at ca. 770 nm compared to the other structures, together with two minor distinct peaks at ca. 440 nm and ca. 330 nm. The resulting spectra are presented in Fig. 11 and the corresponding shifts compared to the bare structure are summarized in Table 1.

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.