Theory for bowtie plasmonic nanolasers.
We develop a fundamental formulation for electrically-pumped plasmonic semiconductor nanolasers based on a metallic bowtie structure. Because of the negative dielectric constant of the metal at optical frequencies, the effective modal volume of the plasmonic mode can be compressed to the nanometer scale. In addition, the curvature effect of the bowtie tips provides additional field enhancement in the bowtie gap and further reduces the modal volume. With this small modal volume, the required volume of the active region is reduced correspondingly, which significantly decreases the threshold current. The huge field enhancement due to the small modal volume at the gap of the bowtie may overcome the material and radiation losses by increasing both the spontaneous and stimulated emission rates, and it makes the lasing action possible.
Chang
Shu-Wei
SW
Department of Electrical and Computer Engineering,University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Ni
Chi-Yu Adrian
CY
Chuang
Shun-Lien
SL
D000465:Algorithms; D004867:Equipment Design; D007834:Lasers; D008670:Metals / Q000737:chemistry; D015233:Models, Statistical; D008962:Models, Theoretical; D036103:Nanotechnology / Q000379:methods*; D053770:Nanowires; D055095:Optics and Photonics; D045663:Quantum Dots; D012666:Semiconductors; D013696:Temperature
D008670:Metals