Pixelated Laser with Tailored Emission Spectrum Photopatterned by Digital Holographic Microscopy

ABSTRACT Organic thin‐film distributed feedback lasers provide broad spectral tunability and structural flexibility. However, the realization of spatially programmable multiwavelength emission across a 2D device area remains a challenge. In this study, this challenge is addressed through programmable fabrication of microresonator geometries using a system that integrates digital holographic microscopy with holographic lithography. Microresonators are first inscribed on an azobenzene‐containing thin film as surface‐relief gratings over localized regions known as pixels via holographic lithography. The pixelated pattern is then transferred onto the active medium using a soft‐lithographic direct‐transfer method to form the lasing structure. This approach enables controlled variation of the microresonator geometry, allowing precise tailoring of the laser emission spectrum. We demonstrate both single‐wavelength emission from individual pixels and simultaneous multiwavelength lasing from collectively excited pixel arrays. The presented strategy provides a scalable platform for programmable organic laser arrays with arbitrary 2D spectral layouts.