Chiral Quasi Bound States in the Continuum for High-Purity Circularly Polarized Light Source Scientists demonstrate high-purity, highly directional, and high-Q circularly polarized light source from spontaneous emission to laser. An ultra-compact circularly polarized light source is a crucial co
Chiral Quasi Bound States in the Continuum for High-Purity Circularly Polarized Light Source
Disadvantages of conventional approaches for circularly polarized photoluminescence include incoherent broadband emission, limited DOP, and large radiating angles. Their practical applications are restricted by low efficiency and energy waste as well as undesired handedness and emission directions. Chiral microlasers can have large DOPs and directional output, but only in specific power ranges. Most importantly, their subthreshold performances drop significantly.
At the C points, incident light with one circular polarization state can be coupled into the nanostructures and produce dramatically enhanced local electromagnetic fields. The other polarization state is decoupled and almost perfectly transmit. Such characteristics are well known but rarely applied to light emissions. “This is mainly because the C points usually deviate from the bottom of band. They have relatively low Q factor and cannot be excited for lasing actions,” says Zhang.
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