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Your search keyword '"Piskunen, Petteri"' showing total 18 results
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18 results on '"Piskunen, Petteri"'

1. Controlling Raman enhancement in particle-aperture hybrid nanostructures by interlayer spacing

Author

Kabusure, Kabusure M., Piskunen, Petteri, Saarinen, Jarkko J., Linko, Veikko, and Hakala, Tommi K.

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Here we show how surface-enhanced Raman spectroscopy (SERS) features can be fine-tuned in optically active substrates made of layered materials. To demonstrate this, we used DNA-assisted lithography (DALI) to create substrates with silver bowtie nanoparticle-aperture pairs and then coated the samples with rhodamine 6G (R6G) molecules. By varying the spacing between the aperture and particle layer, we were able to control the strength of the interlayer coupling between the plasmon resonances of the apertures and those of the underlying bowtie particles. The changes in the resulting field enhancements were confirmed by recording the Raman spectra of R6G from the substrates, and the experimental findings were supported with finite difference time domain (FDTD) simulations including reflection/extinction and near-field profiles., Comment: 6 pages, 4 figures

Published
2024

2. Raman Enhancement in Bowtie-Shaped Aperture-Particle Hybrid Nanostructures Fabricated with DNA-Assisted Lithography

Author

Kabusure, Kabusure M., Piskunen, Petteri, Yang, Jiaqi, Linko, Veikko, and Hakala, Tommi K.

Subjects
Condensed Matter - Materials Science, Physics - Optics
Abstract

We report on efficient surface-enhanced Raman spectroscopy (SERS) supporting substrates, which are based on DNA-assisted lithography (DALI) and a layered configuration of materials. In detail, we used nanoscopic DNA origami bowtie templates to form hybrid nanostructures consisting of aligned silver bowtie-shaped particles and apertures of similar shape in a silver film. We hypothesized that this particular geometry could facilitate a four-fold advantage in Raman enhancement compared to common particle-based SERS substrates, and further, we verified these hypotheses experimentally and by finite difference time domain simulations. In summary, our DALI-fabricated hybrid structures suppress the background emission, allow emission predominantly from the areas of high field enhancement, and support additional resonances associated with the nanoscopic apertures. Finally, these nanoapertures also enhance the fields associated with the resonances of the underlying bowtie particles. The versatility and parallel nature of our DNA origami-based nanofabrication scheme and all of the above-mentioned features of the hybrid structures therefore make our optically resonant substrates attractive for various SERS-based applications., Comment: 7 pages, 4 figures, Supporting Information (5 pages, 3 tables, 1 figure)

Published
2023
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12. Advanced DNA Nanopore Technologies

Author

Shen, Boxuan, primary, Piskunen, Petteri, additional, Nummelin, Sami, additional, Liu, Qing, additional, Kostiainen, Mauri A., additional, and Linko, Veikko, additional

Published
2020
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13. Robotic DNA Nanostructures

Author

Nummelin, Sami, primary, Shen, Boxuan, additional, Piskunen, Petteri, additional, Liu, Qing, additional, Kostiainen, Mauri A., additional, and Linko, Veikko, additional

Published
2020
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15. DNA Origami-Mediated Substrate Nanopatterning of Inorganic Structures for Sensing Applications

Author

Piskunen, Petteri, Shen, Boxuan, Julin, Sofia, Ijäs, Heini, Toppari, Jussi J., Kostiainen, Mauri A., Linko, Veikko, Biohybrid Materials, Department of Bioproducts and Biosystems, University of Jyväskylä, Aalto-yliopisto, and Aalto University

Subjects
General Immunology and Microbiology, General Chemical Engineering, General Neuroscience, nanotekniikka, Biosensing Techniques, DNA, substrate patterning, Silicon Dioxide, Spectrum Analysis, Raman, optics, plasmonics, General Biochemistry, Genetics and Molecular Biology, optiikka, Nanostructures, nanorakenteet, Humans, Nanotechnology, Printing, DNA nanotechnology, nanohiukkaset, DNA origami, metal nanoparticles, nanolithography
Abstract

Structural DNA nanotechnology provides a viable route for building from the bottom-up using DNA as construction material. The most common DNA nanofabrication technique is called DNA origami, and it allows high-throughput synthesis of accurate and highly versatile structures with nanometer-level precision. Here, it is shown how the spatial information of DNA origami can be transferred to metallic nanostructures by combining the bottom-up DNA origami with the conventionally used top-down lithography approaches. This allows fabrication of billions of tiny nanostructures in one step onto selected substrates. The method is demonstrated using bowtie DNA origami to create metallic bowtie-shaped antenna structures on silicon nitride or sapphire substrates. The method relies on the selective growth of a silicon oxide layer on top of the origami deposition substrate, thus resulting in a patterning mask for following lithographic steps. These nanostructure-equipped surfaces can be further used as molecular sensors (e.g., surface-enhanced Raman spectroscopy (SERS)) and in various other optical applications at the visible wavelength range owing to the small feature sizes (sub-10 nm). The technique can be extended to other materials through methodological modifications; therefore, the resulting optically active surfaces may find use in development of metamaterials and metasurfaces.

Published
2019

16. Biotemplated Lithography of Inorganic Nanostructures (BLIN) for Versatile Patterning of Functional Materials.

Author

Piskunen, Petteri, Shen, Boxuan, Keller, Adrian, Toppari, J. Jussi, Kostiainen, Mauri A., and Linko, Veikko

Abstract

Here, we present a highly parallel fabrication method dubbed biotemplated lithography of inorganic nanostructures (BLIN) that enables large-scale versatile substrate patterning of metallic and semiconducting nanoshapes with various aspect ratios. We demonstrate the feasibility of our method by employing custom DNA origami structures and Tobacco mosaic virus (TMV) as biotemplates for pattern mask formation. Subsequently, we show high-throughput fabrication of plasmonic (Au and Ag), semiconducting (Ge), and metallic (Al and Ti) nanoparticles on substrates such as indium tin oxide coated glass and silicon wafers. The patterning ability of BLIN ranges from ∼10 to 20 nm feature sizes (with DNA origami, dimensions ∼100 nm or less) to micrometer-long nanowires (with TMV). This combination of scales and material freedom could, with further improvements, provide a cost-efficient pathway for the mass production of versatile nanopatterned surfaces with even smaller feature sizes. BLIN presents a major advantage compared to similar, previously reported techniques, as it permits the use of inexpensive and highly convenient substrates such as optical glass while simultaneously imposing minimal material restrictions on the fabricated nanostructures. Therefore, we believe our method can serve as a viable and potent alternative to current state-of-the-art approaches to produce optically active substrates with various applications in plasmonics (resonances at the visible wavelength range), biosensing (surface enhanced Raman spectroscopy), and functional metamaterials. [ABSTRACT FROM AUTHOR]

Published
2021
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18. Arvometallien jakautuminen nikkelin liekkisulatuksessa

Author

Avarmaa, Katri, Johto, Hannu, Kemian tekniikan korkeakoulu, Taskinen, Pekka, Piskunen, Petteri, Avarmaa, Katri, Johto, Hannu, Kemian tekniikan korkeakoulu, Taskinen, Pekka, and Piskunen, Petteri

Published
2017

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