Catalytic Metasurfaces
Empowered by Bound States in
the Continuum
Posted on 2022-08-12 - 00:20
Photocatalytic platforms based on ultrathin reactive
materials
facilitate carrier transport and extraction but are typically restricted
to a narrow set of materials and spectral operating ranges due to
limited absorption and poor energy-tuning possibilities. Metasurfaces,
a class of 2D artificial materials based on the electromagnetic design
of nanophotonic resonators, allow optical absorption engineering for
a wide range of materials. Moreover, tailored resonances in nanostructured
materials enable strong absorption enhancement and thus carrier multiplication.
Here, we develop an ultrathin catalytic metasurface platform that
leverages the combination of loss-engineered substoichiometric titanium
oxide (TiO2–x) and the emerging
physical concept of optical bound states in the continuum (BICs) to
boost photocatalytic activity and provide broad spectral tunability.
We demonstrate that our platform reaches the condition of critical
light coupling in a TiO2–x BIC
metasurface, thus providing a general framework for maximizing light–matter
interactions in diverse photocatalytic materials. This approach can
avoid the long-standing drawbacks of many naturally occurring semiconductor-based
ultrathin films applied in photocatalysis, such as poor spectral tunability
and limited absorption manipulation. Our results are broadly applicable
to fields beyond photocatalysis, including photovoltaics and photodetectors.
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Hu, Haiyang; Weber, Thomas; Bienek, Oliver; Wester, Alwin; Hüttenhofer, Ludwig; Sharp, Ian D.; et al. (2022). Catalytic Metasurfaces
Empowered by Bound States in
the Continuum. ACS Publications. Collection. https://doi.org/10.1021/acsnano.2c05680
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AUTHORS (9)
HH
Haiyang Hu
TW
Thomas Weber
OB
Oliver Bienek
AW
Alwin Wester
LH
Ludwig Hüttenhofer
IS
Ian D. Sharp
SM
Stefan A. Maier
AT
Andreas Tittl
EC
Emiliano Cortés
KEYWORDS
emerging physical conceptcritical light couplingboost photocatalytic activitythus carrier multiplicationpoor spectral tunabilityoptical bound stateslimited absorption manipulationfields beyond photocatalysisdiverse photocatalytic materialscatalytic metasurfaces empowered> sub >)limited absorptionbound statesthus providingpoor energy> subx wide rangetypically restrictedtuning possibilitiestailored resonancesstanding drawbacksplatform reachesnarrow setnanophotonic resonatorsincluding photovoltaicsgeneral frameworkelectromagnetic designbroadly applicablebic metasurface2 –<