Circularly Polarized Laser with Chiral Nematic Cellulose Nanocrystal Cavity.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33961409.
- Also identified by DOI 10.1021/acsnano.1c01001 and PMC identifier 8266174.
- Licence recorded as CC BY-NC-ND.
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Abstract
Circularly polarized (CP) lasers derived from low-cost and renewable raw sources are attracting increasing attention in photonics and material science. Here, we present a facile and effective approach to fabricate CP lasers by the evaporation-induced assembly of cellulose nanocrystals (CNCs) and a laser dye. The obtained laser exhibits a controlled chiral nematic structure, which acts as a chiral optical cavity, and varied chiral coupling interactions. It is shown that the CNC-based laser can modify the polarization state of the laser into left-handed polarization, leading to strong CP laser emission (CPLE) with a dissymmetry factor up to 0.35. The chiral nematic CNC structure proves to be a versatile yet straightforward strategy to generate strong and tailored CPLE.