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LETTER
doi:10.1038/nature13455
Giant nonlinear response from plasmonic
metasurfaces coupled to intersubband transitions
1 1 1 1 1 2 2
Jongwon Lee , Mykhailo Tymchenko , Christos Argyropoulos , Pai-Yen Chen , Feng Lu , Frederic Demmerle , Gerhard Boehm ,
2 `1 1
Markus-Christian Amann , Andrea Alu Mikhail A. Belkin
Intersubband transitions in n-doped multi-quantum-well semicon- and have enabled the development of mass-producible room-temperature
ductor heterostructures make it possible to engineer one of the largest electrically pumped sources of THz radiation7. A power conversion effi-
known nonlinear optical responses in condensed matter systems— ciency ofnearly1%for second harmonicgeneration (SHG) at a 8.6 mmfun-
but this nonlinear response is limited to light with electric field po- damental frequency was achieved in waveguides with passive In0.53Ga0.47As/
larized normal to the semiconductor layers1–7. In a different context, Al0.48In0.52As MQW structures25 and a power conversion efficiency of
plasmonic metasurfaces (thin conductor–dielectric composite mate- over 16% was theoretically predicted26. However, the integration of giant
rials) have been proposed as a way of strongly enhancing light–matter MQW nonlinearities with free-space optics is very challenging, because
interaction and realizing ultrathin planarized devices with exotic wave optical transitions between electron subbands are intrinsically polarized
properti
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