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Transparent Hybrid Opals with Unexpected Strong Resonance‐Enhanced Photothermal Energy Conversion
Author(s) -
Cang Yu,
Lee Jaejun,
Wang Zuyuan,
Yan Jiajun,
Matyjaszewski Krzysztof,
Bockstaller Michael R.,
Fytas George
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202004732
Subject(s) - materials science , photonics , photothermal therapy , absorption (acoustics) , fabrication , nanotechnology , optoelectronics , thermophotovoltaic , metamaterial , microfluidics , microfabrication , radiant energy , optics , composite material , medicine , common emitter , alternative medicine , physics , pathology , radiation
Photothermal energy conversion is of fundamental importance to applications ranging from drug delivery to microfluidics and from ablation to fabrication. It typically originates from absorptive processes in materials that—when coupled with non‐radiative dissipative processes—allow the conversion of radiative energy into heat. Microstructure design provides versatile strategies for controlling light–matter interactions. In particular, the deliberate engineering of the band structure in photonic materials is known to be an effective approach to amplify absorption in materials. However, photonic amplification is generally tied to high optical contrast materials which limit the applicability of the concept to metamaterials such as microfabricated metal–air hybrids. This contribution describes the first observation of pronounced amplification of absorption in low contrast opals formed by the self‐assembly of polymer‐tethered particles. The dependence of the amplification factor on the length scale and degree of order of materials as well as the angle of incidence reveal that it is related to the slow photon effect. A remarkable amplification factor of 16 is shown to facilitate the rapid “melting” of opal films even in the absence of “visible” absorption. The results point to novel opportunities for tailoring light–matter interactions in hybrid materials that can benefit the manipulation and fabrication of functional materials.