Abstract
Demonstrated that analog of diffractive and refractive 3D optics in free space can be developed to manipulate surface waves such as surface plasmon polaritons (SPPs). It has been shown that an air-gap control of a floating dielectric block can generate the dynamic phase and amplitude modulation of the SPP transmission coefficient. Unlike conventional bulk optics, the nano-scale surface optics for SPP processing contains several unexpected and interesting features in addition to the physical features described. Dynamic plasmonic information processing on the nano-scale using air-gap control may be an effective mechanism for building a dynamic plasmonic information processing system.
Highlights
THz and optical information processing on the nano-scale is considered to be a main objective in the field of nanophotonics
Once the basic optical manipulation of surface plasmon polaritons (SPPs) has become routine, it will pave the way for more sophisticated devices, including different wavebands, possibly including confocal microscopes with sub-diffraction limited resolution obtained by focusing of SPP fields [4]
We have demonstrated that analogs of diffractive and refractive 3D optics in free space can be developed to manipulate surface waves such as SPPs and focusing electromagnetic waves with diffraction limit
Summary
THz and optical information processing on the nano-scale is considered to be a main objective in the field of nanophotonics. THz and optical information processing on the nano-scale has become a reality because of the exploitation of the full potential of surface plasmon polaritons (SPPs) [1,2,3]. SPPs are electromagnetic surface waves formed through strong interaction between electromagnetic field and free electron oscillations at a metal-dielectric interface. One of unique properties of the SPPs is that SPPs wavelength can be shorter than the wavelength of radiation in surrounding media, leading to applications in sub-diffraction-limited techniques. Discovering this effect birthed many new research areas in SPP/subwavelength optics or other spectral band fields. The energy coupled to the SP is diffracted by the grating while SP propagates along the grating surface
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