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Investigation of dipole emission near a dielectric metasurface using a dual-tip scanning near-field optical microscope

Abbasirad, Najmeh; Barreda, Angela; Arslan, Dennis; Steinert, Michael; Fasold, Stefan; Rockstuhl, Carsten; Staude, Isabelle; Setzpfandt, Frank; Pertsch, Thomas

Abstract:
A wide variety of near-field optical phenomena are described by the interaction of dipole radiation with a nanophotonic system. The electromagnetic field due to the dipole excitation is associated with the Green’s function. It is of great interest to investigate the dipole interaction with a photonic system and measure the near-field Green’s function and the quantities it describes, e.g., the local and cross density of optical states. However, measuring the near-field Green’s function requires a point-source excitation and simultaneous near-field detection below the diffraction limit. Conventional single-tip near-field optical microscope (SNOM) provides either a point source excitation or amplitude and phase detection with subwavelength spatial resolution. The automated dual-tip SNOM, composed of two tips, has overcome the experimental challenges for simultaneous near-field excitation and detection. Here, we investigate the dipole emission in the near-field of a dielectric metasurface using the automated dual-tip SNOM. We have analyzed the near-field pattern and directional mode propagation depending on the position of the dipole emission relative to the metasurface. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000139757
Veröffentlicht am 12.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2192-8614, 2192-8606
KITopen-ID: 1000139757
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Erschienen in Nanophotonics
Verlag De Gruyter
Schlagwörter dielectric metasurface; dipole emission; dual-tip SNOM; Green’s function; near-field; partial LDOS
Nachgewiesen in Scopus
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