Lasing Conditions of Transverse Electromagnetic Modes in Metallic-Coated Micro- and Nanotubes

PASSARELLI, NICOLÁS; BUSTOS-MARÚN, RAÚL; DEPINE, RICARDO

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Lugar: Washington; Año: 2019

1932-7447

In thiswork, we study the lasing conditions ofthe transverse electric (TE)modes of micro- and nanotubescoated internally with a thin metalliclayer. This geometry maytackle some of the problems of nanolasers andspasers as itallows the recycling of the active medium whileproviding atunable plasmonic cavity. The system presents two types ofTEmodes: cavity modes (CMs) and whispering-gallery modes(WGMs). Onthe one hand, we show that the lasing of WGMis only possible innanoscale tubes. On the other hand, fortubes of some micrometers ofdiameter, we found that thesystem presents a large number of CMs withlasing frequencieswithin the visible and near-infrared spectrum andvery low gain thresholds. Moreover, the lasing frequencies of CMs canbeaccurately described by a simple one-parameter model. Our resultsmay be useful in the design of micro- and nanolasersfor?lab-on-chip?devices,ultradense data storage, nanolithography, or sensingp { margin-bottom: 0.1in; line-height: 115%; background: transparent none repeat scroll 0% 0%; }