14 December 2010 Performance of SNOM probes with one groove at core: cladding interface
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Proceedings Volume 7746, 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 77460Z (2010) https://doi.org/10.1117/12.882789
Event: 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2010, Liptovsky Jan, Slovakia
Abstract
Resolution of scanning near-field optical microscopes is limited by a sum of the aperture diameter at the tip of a tapered waveguide probe and twice the skin depth in metal used for coating. To increase the resolution we need to decrease the aperture diameter, to this end increase of energy throughput is necessary. Recently, we proposed that the interface between the fiber core and metal coating is structured into parallel grooves of different profiles curved inward the core. The role of grooves is to facilitate conversion of photons to plasmons at the core - cladding interface. In this paper we prove that a singe groove is enough to increase energy throughput by 500% in the case of aluminum cladding and 3000% for gold cladding over probes without corrugations. Moreover, one groove assures better transmission than a set of 10 grooves. Our investigations of aluminum, copper and gold coated probes are carried out using finite-difference time-domain simulations within the optical range 400-700 nm, a computational volume equal 30μm3, and discretisation step 0.5 nm.
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Tomasz J. Antosiewicz, Tomasz J. Antosiewicz, Piotr Wróbel, Piotr Wróbel, Tomasz Szoplik, Tomasz Szoplik, } "Performance of SNOM probes with one groove at core: cladding interface", Proc. SPIE 7746, 17th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 77460Z (14 December 2010); doi: 10.1117/12.882789; https://doi.org/10.1117/12.882789
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