A low-threshold nanolaser based on hybrid plasmonic waveguides at the deep subwavelength scale

Abstract

A novel nanolaser structure based on a hybrid plasmonic waveguide is proposed and investigated. The coupling between the metal nanowire and the high-index semiconductor nanowire with optical gain leads to a strong field enhancement in the air gap region and low propagation loss, which enables the realization of lasing at the deep subwavelength scale. By optimizing the geometric parameters of the structure, a minimal lasing threshold is achieved while maintaining the capacity of ultra-deep subwavelength mode confinement. Compared with the previous coupled nanowire pair based hybrid plasmonic structure, a lower threshold can be obtained with the same geometric parameters. The proposed nanolaser can be integrated into a miniature chip as a nanoscale light source and has the potential to be widely used in optical communication and optical sensing technology.

A high-quality factor hybrid plasmonic nanocavity based on distributed Bragg reflectors*

“…As a result, the gain threshold α th for the hybrid plasmonic nanocavity with L 2 = 126 nm is calculated to be 266 cm −1 , much smaller than that of the recently reported plasmonic lasing structures. [22,24] 1300 1400 1500 1600 1700 1800…”

Improved optical performance in circular-grating distributed feedback nanoplasmonic lasers

“…The hybrid surface plasmonic mode is a surface plasmonic wave mode formed by the interaction of free electrons and light field at the interface of metal film and medium due to the excitation of electromagnetic field [34]. The mode characteristics include effective refractive index eff n , effective transmission loss eff  , normalized mode field area SF and mode field limiting factor  .…”

Perovskite Hybrid Surface Plasmon Waveguide

“…The mode characteristic is an important index to reflect the characteristics of the hybrid surface plasmonic waveguide. The mode characteristics [14] studied in this paper include the concepts of the effective index ( eff n ), normalized mode scaling factor ( SF ), confinement factor (  ), gain threshold ( th g ) and quality factor ( Q ).…”