Exponentially Amplified Circularly Polarized Lasing from Chiral Carbon Dots

Abstract

ABSTRACT Circularly polarized luminescence (CPL) provides unique spin‐selective information, offering a crucial platform for the development of efficient spin‐dependent optical devices and advancing next‐generation photonic technologies. However, the intrinsically weak chiroptical response of CPL materials significantly limits their applications. To address this issue, this study proposes a strategy for the acid‐driven self‐assembly of carbon dots (CDs) into microhelical structures, which increases the dissymmetry factor ( g ‐factor) from less than 10 −5 to 6.5 × 10 −3 . Thus, circularly polarized laser emission was achieved for the first time in the field of CDs using an optical pumping system. The g ‐factor was exponentially amplified to 1.05, the threshold was as low as 28.91 mJ cm −2 , and the device exhibited excellent stability with no significant intensity attenuation after 15 h of operation. Using this high‐polarization laser, a rapid‐response circularly polarized laser logic gate system was successfully established. This study presents a novel material system and design model for developing high‐performance, low‐cost, carbon‐based chiral laser devices and integrated optical information processing devices.