title: Recapturing lost evanescent power by tuning end face total internal reflection capable tunneling modes at a roughened fiber end face.
abstract: We reveal that the overall evanescent wave (EW) power captured by an unclad multimode fiber employed in a sensing configuration is determined by the tunneling modes, not the guided modes. While enormous in strength, most of this power is inaccessible using traditional EW power enhancers. However, we found that by roughening the fiber end face, this supposedly lost power can be recaptured and thus can boost the detectable power level significantly. Intensive mode mixing events across various mode categories are proposed to interpret the observed phenomenon.
authors.affiliation: Centre de recherche en photonique, Département d'informatique et d'ingénierie, Université du Québec en Outaouais, Gatineau, Québec, Canada. ma.jianjun@uqo.ca
authors.forename: Jianjun
authors.initials: J
authors.lastname: Ma
authors.forename: Yasser
authors.initials: Y
authors.lastname: Chiniforooshan
authors.forename: Jiahua
authors.initials: J
authors.lastname: Chen
authors.forename: Wojtek J
authors.initials: WJ
authors.lastname: Bock
authors.forename: Wenhui
authors.initials: W
authors.lastname: Hao
authors.forename: Zhi Yuan
authors.initials: ZY
authors.lastname: Wang