Nanoantenna arrays for nanospectroscopy, methods of use and methods of high-throughput nanofabrication
The present invention generally relates to nanoantenna arrays and fabrication methods of said nanoantenna arrays. In particular, one aspect relates to nanoantenna arrays including nanostructures of predefined shapes in predefined patterns, which results in collective excitement of surface plasmons. The nanoantenna arrays can be used for spectroscopy and nanospectroscopy. Another aspects of the present invention relate to a method of high-throughput fabrication of nanoantenna arrays includes fabricating a reusable nanostencil for nanostensil lithography (NSL) which provides a mask to deposit materials onto virtually any support, such as flexible and thin-film stretchable supports. The nanostencil lithography methods enable high quality, high-throughput fabrication of nanostructures on conducting, non-conducting and magnetic supports. The nanostencil can be prepared by etching nanoapertures of predefined patterns into a waffer or ceramic membrane. In some embodiments, a nanoantenna array includes plasmonic nanostructures or non-plasmonic nanostructures.
1. A nanoantenna array device comprising;
a. a flexible support selected from a thin film support, a sticky support or elastic support, wherein the flexible support can conform to be fitted inside a predefined shape, void or recess, or wrapped on the outside of an element;
b. a plurality of plasmonic nanostructures on the flexible support, the plasmonic nanostructures
(i) having predefined three-dimensional-shapes, each plasmonic nanostructure having a substantially consistent shape of an upper surface and a surface contacting the flexible support, where the upper surface is consistently flat and the side walls are perpendicular to the surface of the flexible support and have a vertical wall profile for localized plasmon resonance; and
(ii) arranged in a predefined periodic pattern with respect to the flexible support for diffracting an incident electromagnetic radiation, wherein the incident electromagnetic radiation forms a diffraction order that is evanescent where the wavelength of the incident electromagnetic radiation is longer than the predefined pattern's periodicity, and wherein the incident electromagnetic radiation forms a diffraction order that is radiative where the wavelength of the incident electromagnetic radiation is shorter than the predefined pattern's periodicity; and
(iii) separated by a periodicity of between λ/2-2λ or λ/4-5λ, wherein λ refers to the wavelength of an electromagnetic radiation; and
(iv) each plasmonic nanostructure having a consistent height of between 10-200 nm, and a consistent surface geometry.
2. The nanoantenna array of claim 1 , wherein the plurality of plasmonic nanostructures are
(i) raised on the surface of the flexible support, and/or
(ii) depressed below the surface of the flexible support.
3. The nanoantenna array of claim 2 , wherein the plurality of plasmonic nanostructures depressed below the surface of the flexible support are layered with a material that is non-wavelength penetrating or can be penetrated by an incident wavelength of electromagnetic radiation.
4. The nanoantenna array of claim 2 , wherein the nanostructures on the surface of the support have minimal or no particle scattering within 20 nm of each of the plasmonic nanostructures.
5. The nanoantenna array of claim 2 , wherein the predefined pattern of nanostructures comprises plasmonic nanostructures of three-dimensional different shapes.
6. The nanoantenna array of claim 1 , wherein the predefined pattern of nanostructures is selected from the group consisting of: a periodic pattern, a non-periodic pattern, a uniform pattern, a lattice, a non-random pattern, and a super-periodic pattern.
7. The nanoantenna array of claim 1 , wherein the flexible support is a non-conductive layer.
8. The nanoantenna array of claim 1 , wherein the predefined three-dimensional shapes of the plasmonic nanostructures are shapes selected from the group consisting of: nanorod, nanorectangle, nanosquare, nanodisc, nanocircle, nano-oval, nanotriangle, cross-shaped, nanowires, or irregular shaped.
9. The nanoantenna array of claim 1 , wherein the plasmonic nanostructures are separated by a periodicity of between 100-10,000 nm.
10. The nanoantenna array of claim 1 , further comprising an adhesive layer, wherein the adhesive layer is between the flexible support and the plurality of plasmonic nanostructures.
11. The nanoantenna array of claim 1 , wherein the plasmonic nanostructures comprise at least one plasmonic material or a nonplasmonic material.
12. The nanoantenna array of claim 1 , wherein the plasmonic nanostructures are coupled to one or more other plasmonic nanostructures.
13. The nanoantenna array of claim 1 , wherein the plasmonic nanostructures comprise a plurality of layers of two or more different plasmonic materials.
14. The nanoantenna array of claim 1 , wherein the plasmonic nanostructures are arranged in a predefined pattern as a function of their localized plasmon resonance.
15. The nanoantenna array of claim 1 , wherein the flexible support has a substantially planar surface.
16. The nanoantenna array of claim 1 , wherein the nanostructure has a consistent height of between 10-120 nm.
17. The nanoantenna array of claim 1 , wherein thin film support is selected from; parylene C film or PDMS or LDPE.
18. The nanoantenna array of claim 1 , wherein the combination of the shape of the nanostructures and the predefined pattern of the nanostructures results in near-field enhancements.
19. The nanoantenna array of claim 1 , wherein the combination of the shape of the nanostructures and the predefined pattern of the nanostructures results in absorption enhancement, where absorption is controlled by the localized plasmon resonance.
20. The nanoantenna array of claim 1 , wherein the flexible support can be stretched to actively tune the periodicity of the nanostructures.
21. The nanoantenna array of claim 20 , wherein the flexible support can be stretched to alter the periodicity of the nanostructures in the x-axis, or the y-axis or the x- and y-axis.
22. The nanoantenna array of claim 1 , wherein the flexible support can be stretched to change the shape of the nanostructures.
23. The nanoantenna array of claim 1 , wherein the flexible support can be stretched to between 1%-20% of its original size.
24. The nanoantenna array of claim 1 , wherein the consistent height is between 70 nm and 160 nm.
25. The nanoantenna array of claim 24 , wherein the consistent height is approximately 150 nm.
26. The nanoantenna array of claim 24 , wherein the consistent height is approximately 100 nm.
27. At least two nanoantenna array devices, each nanoantenna array device comprising;
a. a flexible support selected from a thin film support, a sticky support or elastic support, wherein the flexible support can conform to be fitted inside a predefined shape, void or recess, or wrapped on the outside of an element;
b. a plurality of plasmonic nanostructures on the flexible support, the plasmonic nanostructures
(i) having predefined three-dimensional-shapes, each plasmonic nanostructure having a substantially consistent shape of an upper surface and a surface contacting the flexible support, wherein the upper surface is consistently flat and the side walls are perpendicular to the surface of the flexible support and have a vertical wall profile for localized plasmon resonance; and
(ii) arranged in a predefined periodic pattern with respect to the flexible support for diffracting an incident electromagnetic radiation, wherein the incident electromagnetic radiation forms a diffraction order that is evanescent where the wavelength of the incident electromagnetic radiation is longer than the predefined pattern's periodicity, and wherein the incident electromagnetic radiation forms a diffraction order that is radiative where the wavelength of the incident electromagnetic radiation is shorter than the predefined pattern's periodicity; and
(iii) separated by a periodicity of between λ/2-2λ or λ/4-5λ, wherein λ refers to the wavelength of an electromagnetic radiation; and
(iv) each plasmonic nanostructure having a consistent height of between 10-200 nm, and a consistent surface geometry,
wherein each nanoantenna device is substantially identical.