Active planar optical waveguide made from luminescent silicon nanocrystals

Valenta, J.; Pelant, I.; Luterová, K.; Tomasiunas, R.; Cheylan, S.; Elliman, R. G.; Linnros, J.; Hönerlage, B.
February 2003
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p955
Academic Journal
We show experimentally that a layer of silicon nanocrystals, prepared by the Si-ion implantation (with the energy of 400 keV) into a synthetic silica slab and exhibiting room-temperature red photoluminescence, can serve simultaneously as a single-mode planar optical waveguide. The waveguide is shown to self-select guided transverse electric and transverse magnetic modes from the broad photoluminescence emission of the nanocrystals resulting in a substantially narrower emission spectrum for these modes. We further report on an investigation of optical gain in a sample implanted to a dose of 4 × 10[sup 17] cm[sup -2]. Despite the occurrence of strong waveguiding, results of the variable stripe length method turned out not to be able to give unambiguous evidence for optical gain.


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