Unravelling the Role of Electric and Magnetic Dipoles in Biosensing with Si Nanoresonators

  • Yavas, Ozlem
  • Svedendahl, Mikael
  • Quidant, Romain
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Publication date
March 2019
Publisher
American Chemical Society (ACS)
Language
English

Abstract

High refractive index dielectric nanoresonators are attracting much attention due to their ability to control both electric and magnetic components of light. Combining confined modes with reduced absorption losses, they have recently been proposed as an alternative to nanoplasmonic biosensors. In this context, we study the use of semi-random silicon nanocylinder arrays, fabricated with simple and scalable colloidal lithography for the efficient and reliable detection of biomolecules in biological samples. Interestingly, electric and magnetic dipole resonances are associated to two different transduction mechanisms: extinction decrease and resonance redshift, respectively. By contrasting both observables, we identify clear advantages in trac...

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