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Pierini F., Guglielmelli A.♦, Urbanek O., Nakielski P., Pezzi L.♦, Buda R.♦, Lanzi M.♦, Kowalewski T.A., De Sio L.♦, Thermoplasmonic‐activated hydrogel based dynamic light attenuator,
Advanced Optical Materials, ISSN: 2195-1071, DOI: 10.1002/adom.202000324, Vol.8, No.12, pp.2000324-1-7, 2020Streszczenie: This work describes the morphological, optical, and thermo‐optical properties of a temperature‐sensitive hydrogel poly(N‐isopropylacrylamide‐co‐N‐isopropylmethacrylamide) [P(NIPAm‐co‐NIPMAm]) film containing a specific amount of gold nanorods (GNRs). The light‐induced thermoplasmonic heating of GNRs is used to control the optical scattering of an initially transparent hydrogel film. A hydrated P(NIPAm‐co‐NIPMAm) film is optically clear at room temperature. When heated to temperatures over 37 °C via light irradiation with a resonant source (λ = 810 nm) to the GNRs, a reversible phase transition from a swollen hydrated state to a shrunken dehydrated state occurs. This phenomenon causes a drastic and reversible change in the optical transparency from a clear to an opaque state. A significant red shift (≈30 nm) of the longitudinal band can also be seen due to an increased average refractive index surrounding the GNRs. This change is in agreement with an ad hoc theoretical model which uses a modified Gans theory for ellipsoidal nanoparticles. Morphological analysis of the composite film shows the presence of well‐isolated and randomly dispersed GNRs. Thermo‐optical experiments demonstrate an all‐optically controlled light attenuator (65% contrast ratio) which can be easily integrated in several modern optical applications such as smart windows and light‐responsive optical attenuators. Słowa kluczowe: active plasmonics, gold nanorods, hydrogels, optical attenuators, optical transparency, plasmonic nanoparticles, polymers Afiliacje autorów:
Pierini F. | - | IPPT PAN | Guglielmelli A. | - | University of Calabria (IT) | Urbanek O. | - | IPPT PAN | Nakielski P. | - | IPPT PAN | Pezzi L. | - | inna afiliacja | Buda R. | - | Institute of Physical Chemistry, Polish Academy of Sciences (PL) | Lanzi M. | - | University of Bologna (IT) | Kowalewski T.A. | - | IPPT PAN | De Sio L. | - | Sapienza University of Rome (IT) |
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