Perovskite materials are highly valued for their efficient, tunable light emission, a property that opens up new possibilities in displays, sensors, lasers, and other photonic technologies. But producing light is only one aspect of what modern photonic devices require. Equally as important is the ability to control how that light behaves, including its wavelength, direction, and coherence, which directly impacts device performance and functionality. Optical quasi-bound-states-in-the-continuum (quasi-BICs) provide a precise mechanism for controlling perovskite emissions using carefully engineered photonic structures. By aligning these structures with the emission characteristics of perovskites, researchers can enhance spectral control, improve efficiency, and enable new device functionalities.

Across crime scenes and forensic laboratories, some of the most decisive evidence arrives in the form of almost invisible threads. Microfibers, released from everyday textiles like clothing or furnishings, can transfer during fleeting contact and linger undetected. Their ability to connect people, places, and objects has made them a cornerstone of forensic trace analysis. But when two fibers appear virtually identical under a microscope, how do investigators tell them apart? The answer lies in a technique that examines the molecular traces left behind by light itself: UV-Vis-NIR microspectroscopy.

Controlling light’s polarization at the moment it is emitted is a powerful capability. It unlocks new possibilities in optical displays, quantum information science, and biosensing. At the heart of this capability is chirally selective luminescence, where light strongly prefers one circular polarization over the other. Traditional methods rely on chiral molecules, but their inherent asymmetry is often too weak to be practical. Instead, researchers are turning to a more robust solution. By combining achiral emitters with twisted metasurfaces, they can generate robust, tunable circularly polarized light in ultra-thin devices. That degree of control is only possible through meticulous spatial engineering, guided by thin film thickness measurements and validated through UV-Vis-NIR microspectroscopy. Together, these tools are redefining how circular polarization is designed, quantified, and applied.

Circularly polarized luminescence (CPL) is vital for emerging technologies in optics and display design, but generating it with both efficiency and full-spectrum color remains a challenge. Quantum dots provide tunable brightness across the visible range but emit unpolarized light. Chiral cellulose nanocrystals (CNCs), by contrast, offer a structured, bio-derived platform for controlling light polarization. When combined, they form a system capable of transforming color-rich emission into precisely polarized output.