Gain enhancement in a hybrid plasmonic nano-waveguide with a low-index or high-index gain medium
2011 (English)In: Optics Express, ISSN 1094-4087, Vol. 19, no 14, 12925-12936 p.Article in journal (Refereed) Published
A theoretical investigation of a nano-scale hybrid plasmonic waveguide with a low-index as well as high-index gain medium is presented. The present hybrid plasmonic waveguide structure consists of a Si substrate, a buffer layer, a high-index dielectric rib, a low-index cladding, a low-index nano-slot, and an inverted metal rib. Due to the field enhancement in the nano-slot region, a gain enhancement is observed, i.e., the ratio partial derivative G/partial derivative g > 1, where g and G are the gains of the gain medium and the TM fundamental mode of the hybrid plasmonic waveguide, respectively. For a hybrid plasmonic waveguide with a core width of w(co) = 30nm and a slot height of h(slot) = 50nm, the intrinsic loss could be compensated when using a low-index medium with a moderate gain of 176dB/cm. When introducing the high-index gain medium for the hybrid plasmonic waveguide, a higher gain is obtained by choosing a wider core width. For the high-index gain case with h(slot) = 50nm and w(co) = 500nm, a gain of about 200dB/cm also suffices for the compensation of the intrinsic loss.
Place, publisher, year, edition, pages
2011. Vol. 19, no 14, 12925-12936 p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-38962DOI: 10.1364/OE.19.012925ISI: 000292876500053ScopusID: 2-s2.0-79959905125OAI: oai:DiVA.org:kth-38962DiVA: diva2:438835
FunderICT - The Next Generation