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DOI: 10.5445/IR/1000088661
Veröffentlicht am 17.12.2018

Inverse photonic design of functional elements that focus Bloch surface waves

Augenstein, Yannick; Vetter, Andreas; Lahijani, Babak Vosoughi; Herzig, Hans Peter; Rockstuhl, Carsten; Kim, Myun-Sik

Bloch surface waves (BSWs) are sustained at the interface of a suitably designed one-dimensional (1D) dielectric photonic crystal and an ambient material. The elements that control the propagation of BSWs are defined by a spatially structured device layer on top of the 1D photonic crystal that locally changes the effective index of the BSW. An example of such an element is a focusing device that squeezes an incident BSW into a tiny space. However, the ability to focus BSWs is limited since the index contrast achievable with the device layer is usually only on the order of Δn≈0.1 for practical reasons. Conventional elements, e.g., discs or triangles, which rely on a photonic nanojet to focus BSWs, operate insufficiently at such a low index contrast. To solve this problem, we utilize an inverse photonic design strategy to attain functional elements that focus BSWs efficiently into spatial domains slightly smaller than half the wavelength. Selected examples of such functional elements are fabricated. Their ability to focus BSWs is experimentally verified by measuring the field distributions with a scanning near-field optical microscope ... mehr

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2047-7538
URN: urn:nbn:de:swb:90-886611
KITopen-ID: 1000088661
HGF-Programm 43.23.01 (POF III, LK 01)
Erschienen in Light
Band 7
Heft 1
Seiten Article No 104
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 12.12.2018
Nachgewiesen in Scopus
Web of Science
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