Seminar: "Plasmonic, non-plasmonic and hybrid nanostructures as key elements to enhance and control light at the nanoscale", by Dr. Pablo Albella (University of Las Palmas de Gran Canaria)

May 10, 2018  IMN Seminar Room, 12PM

Light scattering by nanoscale objects such as molecules or nanoparticles provides a valuable tool to obtain spectroscopic information on the electronic, optical and chemical properties of the object. Scattering from molecules is generally very small, however, optical antennas can transform light from freely propagating waves into highly localized excitations that interact strongly with matter. These nanoantennas are usually made of metallic (plasmonic) nanostructures and employed to obtain strong light-matter interactions at deep subwavelength size scales. However, its ohmic losses lead to temperature increase in the metal and surroundings. Another limitation of metals is the difficulty to generate optical magnetic response.?

In this seminar I will first review some of the typical plasmonic nanoantennas often used in surface enhanced spectroscopies. Later, I will?describe?how the use of low-loss resonators made of high-permittivity dielectric materials (non-plasmonic) can also be very efficient in enhancing light, producing both, large near field enhancement and good scattering efficiencies while generating small heat radiation, showing them very interesting for surface enhance spectroscopy applications. Third, I will discuss another key aspect of these nanoantennas, which is the possibility of exciting nanoscale displacement currents that can lead to magnetic response, allowing the tuning of the amplitude and phase difference of electric and magnetic resonances independently, something that opens new paths to control the way light propagates at the nanoscale. And, I will conclude discussing how these novel type of nanoantennas when combined with plasmonic ones can offer interesting effects in non-linear optics, metasurfaces or sensing based on magnetoplasmonic crystals.

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