2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122797We present an experiment where a single molecule strongly affects the amplitude and phase of a laser field emerging from a subwavelength aperture. We achieve a visibility of -6% in direct and +10% in cross-polarized detection schemes. Our analysis shows that a close to full extinction should be possible using near-field excitation.5 pages, 4 figures, submitted to PRLQuantum Physicstext