Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Selection and Visualization of Degenerate Magnetic and Electric Multipoles up to Radial Higher Orders by Cathodoluminescence
Δημιουργός/Συγγραφέας:	Matsukata T. Matthaiakakis N. Yano T.-A. Hada M. Tanaka T. Yamamoto N. Sannomiya T.
Εκδότης:	American Chemical Society
Ημερομηνία:	2019
Γλώσσα:	Αγγλικά
ISSN:	2330-4022
DOI:	10.1021/acsphotonics.9b00833
Περίληψη:	Interference of electromagnetic multipoles can result in strong directionality of the electromagnetic waves from a single-object antenna, which is essential to realize directional optical nanoantennas below the wavelength of light. Beaming even from a spherically symmetric nanoantenna can be achieved when magnetic modes are utilized in dielectric antennas. More tuning parameters become available by including modes with multiple nodes in the radial direction inside the structure, which we call "radial higher order modes". To date, the resultant optical field of such radial higher order and magnetic modes had not been experimentally accessible, as the electric displacement field is enclosed inside the structure. The higher degree of degeneracy of the higher order modes also makes the selective observation difficult. In this study, we visualize the internal field of selected degenerate electric and magnetic modes including the radial higher order modes for the first time, using an angle- and polarization-resolved cathodoluminescence based on scanning transmission electron microscopy. Strong radiation directionality due to the interference of eigenmodes is also obtained from spherical nanospheres, which flips drastically by phase change at the resonance.
Τίτλος πηγής δημοσίευσης:	ACS Photonics
Τόμος/Κεφάλαιο:	6
Τεύχος:	9
Σελίδες:	2320-2326
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	cathodoluminescence directionality higher order mode magnetic mode multipole nanoantenna scanning transmission electron microscopy
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 American Chemical Society.
Σημειώσεις:	JPMJPR17P8; Japan Society for the Promotion of Science, KAKEN: 17K19025 This work was supported by JST PRESTO (JPMJPR17P8) and the Japanese Society for the Promotion of Science (17K19025).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο