Switchable dual-mode nanolaser: mastering emission and invisibility through phase transition materials

Area of Science:

• Photonics and Nanotechnology
• Materials Science

Background:

• The principle of detailed balance links emission and absorption, posing challenges for photonic devices like lasers and solar cells.
• Achieving dual functionality—efficient emission and invisibility—in a single device is crucial for advanced applications.
• Existing designs often require modifications to pumping conditions to switch between states.

Purpose of the Study:

• To propose and investigate a novel nanolaser design capable of switching between lasing and cloaking states.
• To demonstrate a reconfigurable metasurface with metaatoms exhibiting reversible lasing-cloaking transitions.
• To ensure optimal performance and explore pumping condition independence.

Main Methods:

• Utilized a semiconductor nanoparticle with gain, enveloped by a phase transition material.
• Investigated nanolaser operational characteristics, including threshold behavior and Purcell enhancement.
• Developed and analyzed a reconfigurable metasurface composed of lasing-cloaking metaatoms.

Main Results:

• Proposed a nanolaser design switching between lasing and nonscattering (cloaking) states at the same frequency without altering pumping.
• Demonstrated thresholdless laser behavior due to high beta-factor and Purcell enhancement in Mie resonance.
• Developed a reversible metasurface transitioning between lasing and nonscattering states.

Conclusions:

• The novel nanolaser design overcomes detailed balance limitations for dual-function photonic devices.
• The proposed metasurface offers reconfigurable optical properties for advanced applications.
• This work paves the way for new photonic devices with switchable emission and scattering characteristics.