Qu Dan, Archimi Matteo, Camposeo Andrea, Pisignano Dario, Zussman Eyal
NanoEngineering Group, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
Dipartimento di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy.
ACS Nano. 2021 May 25;15(5):8753-8760. doi: 10.1021/acsnano.1c01001. Epub 2021 May 7.
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.
源自低成本可再生原料的圆偏振（CP）激光器在光子学和材料科学领域正吸引着越来越多的关注。在此，我们展示了一种简便有效的方法，通过纤维素纳米晶体（CNC）与激光染料的蒸发诱导组装来制造CP激光器。所获得的激光器呈现出可控的手性向列相结构，其作为手性光学腔，并具有多样的手性耦合相互作用。结果表明，基于CNC的激光器能够将激光的偏振态改变为左旋偏振，从而产生不对称因子高达0.35的强圆偏振激光发射（CPLE）。手性向列相CNC结构被证明是一种通用且直接的策略，可用于产生强且定制的CPLE。
