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DNA-driven self-assembly enables precise positioning of the colloidalnanoparticles owing to specific Watson-Crick interactions. Another importantfeature of this self-assembly method is its reversibility by controlling thetemperature of the medium. In this work, we study the potential of anothermechanism to control binding/unbinding process of the DNA-functionalized goldnanoparticles. We employ the laser radiation that can be absorbed by the goldnanoparticles to heat their network and disassociate it. Here, we show that wecan actively control the optical properties of the nanoparticle network by anexternal optical excitation. We find out that by irradiating the structure witha green hand-held laser the total transmittance can increase by ~30% comparedto the transmittance of the sample not irradiated by the laser. Similarly, theoptical microscopy images indicate the transformation of the nanoparticlenetwork from opaque to transparent while the nanoparticles formed a networkagain after the laser irradiation stopped. Our results prove that the opticalexcitation can be used to tailor the structure and thus the optical propertiesof the DNA-self-assembled nanoparticle networks.

Tuning Optical Properties of Self-Assembled Nanoparticle Network with External Optical Excitation