Browsing by Author "Weng, Chen-Ya"

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Cladding Effect on Hybrid Plasmonic Nanowire Cavity at Telecommunication Wavelengths
(2013-05-01)
Cheng, Pi-Ju
;
Weng, Chen-Ya
;
Chang, Shu-Wei
;
Lin, Tzy-Rong
;
Tien, Chung-Hao
In this paper, we investigate the effect of cladding layers on a hybrid plasmonic nanowire cavity. A decent confinement factor and moderate modal loss can be achieved for lasing. Within a certain index range of the cladding layer, the fundamental hybrid plasmonic mode is well confined inside the narrow gain region and becomes the most promising lasing mode. Our results also indicate that the mirror loss can be reduced if the refractive index of the cladding layer is properly chosen. An estimated cold-cavity quality factor of 87, corresponding to a threshold gain of about 1072 cm(-1), is achievable at a cavity length of 10.13 mu m for the lasing mode.
Plasmonic gap mode nanocavities at telecommunication wavelengths
(2014)
Cheng, Pi-Ju
;
Weng, Chen-Ya
;
Chang, Shu-Wei
;
Lin, Tzy-Rong
;
Tien, Chung-Hao
We analyze a plasmonic gap-mode Fabry-Perot nanocavity containing a metallic nanowire. The proper choice of the cladding layer brings about a decent confinement inside the active region for the fundamental and first-order plasmonic gap modes. We numerically extract the reflectivity of the fundamental and first-order mode and obtain the optical field inside the cavity. We also study the dependence of the reflectivity on the thickness of Ag reflectors and show that a decent reflectivity above 90 % is achievable. For such cavities with a cavity length approaching 1.5 pm, a quality factor near 150 and threshold gain lower than 1500 cm-1 are achievable.
Plasmonic gap-mode nanocavities with metallic mirrors in high-index cladding
(2013-06-03)
Cheng, Pi-Ju
;
Weng, Chen-Ya
;
Chang, Shu-Wei
;
Lin, Tzy-Rong
;
Tien, Chung-Hao
We theoretically analyze plasmonic gap-mode nanocavities covered by a thick cladding layer at telecommunication wavelengths. In the presence of high-index cladding materials such as semiconductors, the first-order hybrid gap mode becomes more promising for lasing than the fundamental one. Still, the significant mirror loss remains the main challenge to lasing. Using silver coatings within a decent thickness range at two end facets, we show that the reflectivity is substantially enhanced above 95 %. At a coating thickness of 50 nm and cavity length of 1.51 mu m, the quality factor is about 150, and the threshold gain is lower than 1500 cm(-1). (C) 2013 Optical Society of America