Submicrometer perovskite plasmonic lasers at room temperature.

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Plasmonic lasers offer sub-diffraction limit light generation in nanoscale mode volumes.
• Achieving three-dimensional submicrometer plasmonic lasing has been a significant challenge.
• Previous demonstrations were limited to one or two dimensions.

Purpose of the Study:

• To demonstrate submicrometer-sized, three-dimensional plasmonic lasers.
• To investigate the key factors enabling efficient plasmonic lasing in miniaturized devices.

Main Methods:

• Fabrication of submicrometer plasmonic lasers using cesium-lead-bromide perovskite (CsPbBr₃) crystals.
• Utilized polymer-coated gold substrates for device fabrication.
• Conducted experimental measurements and simulations on over 100 plasmonic and photonic devices.

Main Results:

• Successfully demonstrated submicrometer plasmonic lasers with dimensions as small as 0.58 μm x 0.56 μm x 0.32 μm (cuboid) and 0.79 μm x 0.66 μm x 0.18 μm (plate).
• Identified enhanced optical gain via the Purcell effect, a large spontaneous emission factor, and a high group index as critical for efficient lasing.
• Operated devices at room temperature.

Conclusions:

• The study presents a viable method for achieving three-dimensional submicrometer plasmonic lasing.
• The findings highlight crucial parameters for the design and optimization of future miniaturized plasmonic lasers.
• This work paves the way for the development of ultra-compact coherent light sources.