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However, the output wavelength and intensity of optical signals are typically fixed by the intrinsic molecular structures and crystal packing modes, rendering continuous and reversible modulation of a sole crystal highly challenging. Herein, we design and synthesize a near\u2010infrared flexible organic crystal, in which dual\u2010mode waveguide output modulation of wavelength and intensity is achieved by synergistically exploiting photonic re\u2010absorption and photothermal\u2010driven fluorescence deactivation. Owing to the pronounced overlap between the absorption and emission spectra, the waveguide output wavelength of the crystal can be continuously tuned from 730 to 824\u00a0nm based on the light propagation distance. Meanwhile, the crystal exhibits rapid, stable, and highly reversible photothermal conversion under 660\u00a0nm laser irradiation. Coupled with temperature\u2010dependent fluorescence deactivation, this photothermal effect enables remote modulation of waveguide output intensity by simply adjusting the irradiation power of the input laser. This work establishes a non\u2010contact, structure\u2010preserving strategy for overall modulation of optical waveguides, providing new opportunities for the development of flexible near\u2010infrared photonic devices and reconfigurable optical systems.<\/jats:p>","DOI":"10.1002\/anie.5856537","type":"journal-article","created":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T13:48:36Z","timestamp":1782136116000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Breaking the Fixed Output: Harnessing Photonic Reabsorption and Photothermal Effects for Tunable NIR Waveguiding in a Flexible Organic Crystal"],"prefix":"10.1002","volume":"65","author":[{"given":"Ziang","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry Jilin University, Qianjin Street  Changchun 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