Solid‐State Cholesteric Liquid Crystals as an Emerging Platform for the Development of Optical Photonic Sensors

Abstract Over the past decade, solid‐state cholesteric liquid crystals (CLC solid ) have emerged as a promising photonic material, heralding new opportunities for the advancement of optical photonic biosensors and actuators. The periodic helical structure of CLC solid s gives rise to their distinctive capability of selectively reflecting incident radiation, rendering them highly promising contenders for a wide spectrum of photonic applications. Extensive research is conducted on utilizing CLC solid ’s optical characteristics to create optical sensors for bioassays, diagnostics, and environmental monitoring. This review provides an overview of emerging technologies in the field of interpenetrating polymeric network‐CLC solid (IPN) and CLC solid ‐based optical sensors, including their structural designs, processing, essential materials, working principles, and fabrication methodologies. The review concludes with a forward‐looking perspective, addressing current challenges and potential trajectories for future research.