Janos Voros

Publications (6)34.75 Total impact

• Article: High-resolution resistless nanopatterning on polymer and flexible substrates for plasmonic biosensing using stencil masks.

  Oscar Vazquez-Mena, Takumi Sannomiya, Mahmut Tosun, Luis G Villanueva, Veronica Savu, Janos Voros, Juergen Brugger
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  ABSTRACT: The development of nanoscale lithographic methods on polymer materials is a key requirement to improve the spatial resolution and performance of flexible devices. Here, we report the fabrication of metallic nanostructures down to 20 and 50 nm in size on polymer materials such as polyimide, parylene, SU-8, and PDMS substrates without any resist processing using stencil lithography. Metallic nanodot array analysis of their localized surface plasmon spectra is included. We demonstrate plasmon resonance detection of biotin and streptavidin using a PDMS flexible film with gold nanodots. We also demonstrate the fabrication of metallic nanowires on polyimide substrates with their electrical characteristics showing an ohmic behavior. These results demonstrate high-resolution nanopatterning and device nanofabrication capability of stencil lithography on polymer and flexible substrates.
  ACS Nano 05/2012; 6(6):5474-81. · 10.77 Impact Factor
• Article: Metallic nanodot arrays by stencil lithography for plasmonic biosensing applications.

  Oscar Vazquez-Mena, Takumi Sannomiya, Luis G Villanueva, Janos Voros, Juergen Brugger
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  ABSTRACT: The fabrication of gold nanodots by stencil lithography and its application for optical biosensing based on localized surface plasmon resonance are presented. Arrays of 50-200 nm wide nanodots with different spacing of 50-300 nm are fabricated without any resist, etching, or lift-off process. The dimensions and morphology of the nanodots were characterized by scanning electron and atomic force microscopy. The fabricated nanodots showed localized surface plasmon resonance in their extinction spectra in the visible range. The resonance wavelength depends on the periodicity and dimensions of the nanodots. Bulk refractive index measurements and model biosensing of streptavidin were successfully performed based on the plasmon resonance shift induced by local refractive index change when biomolecules are adsorbed on the nanodots. These results demonstrate the potential of stencil lithography for the realization of plasmon-based biosensing devices.
  ACS Nano 02/2011; 5(2):844-53. · 10.77 Impact Factor
• Article: In situ sensing of single binding events by localized surface plasmon resonance.

  Takumi Sannomiya, Christian Hafner, Janos Voros
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  ABSTRACT: Single binding events of nanoparticle-labeled DNA strands were detected as stepwise peak shifts in localized surface plasmon resonance by single particle measurement. We confirmed the number of binding events by observing label particles by scanning electron microscopy. Our simulation based on a multiple multipole program showed that the peak shift is dependent on interparticle gap size and binding position. The experimental peak shift distribution was also reproduced by simulation.
  Nano Letters 10/2008; 8(10):3450-5. · 13.20 Impact Factor
• Source

  Available from: ArXiv

  Article: Reversible mesoscopic model of protein adsorption: From equilibrium to dynamics

  Gergely J. Szollosi, Imre Derenyi, Janos Voros
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  ABSTRACT: We present a thermodynamically consistent mesoscopic model of protein adsorption at liquid-solid interfaces. First describing the equilibrium state under varying protein concentration of the solution and binding conditions, we predict a non-trivial (non- monotonic) dependence of the experimentally observable properties of the adsorbed layer (such as the surface density and surface coverage) on these parameters. We subsequently proceed to develop a dynamical model consistent with the equilibrium description, which qualitatively reproduces known experimental phenomena and offers a promising way of studying the exchange of the adsorbed proteins by the proteins of the solution.
  12/2005;
• Article: Metallic Nanodot Arrays Fabricated by Stencil Lithography on SiO2 and Polymer Substrates

  Oscar Vazquez-Mena, Takumi Sannomiya, Luis Guillermo Villanueva, Veronica Savu, Katrin Sidler, Janos Voros, Juergen Brugger
• Article: Fabrication of Metallic Nanodots by Stencil Lithography for Localized Surface Plasmon Resonance Biosensing .

  Oscar Vazquez-Mena, Takumi Sannomiya, Luis Guillermo Villanueva, Janos Voros, Juergen Brugger