|Title:||Leveraging Nonlocal and Nonlinear Effects in Metallic Nanoparticles for Optical Metamaterials|
|Speaker:||Smith, David R.|
|Group/Series/Folder:||Record Group 8.15 - Institute for Advanced Study|
Series 3 - Audio-visual Materials
|Notes:||IAS Distinguished Lecture.|
Croucher Advanced Study Institute on New Materials and New Concepts for Controlling Light and Waves. Tutorial no.3
Host: HKUST Institute for Advanced Study.
Sponsor: The Croucher Foundation.
Abstract: The structured metal inclusions that have been so successful in forming metamaterials at microwave frequencies have proven much less attractive as those structures are scaled towards optical metamaterials. At frequencies above a few terahertzes, metals evolve from being good conductors to lossy insulators. Fortunately, some of the important features of low frequency metamaterials are retained into the optical, including the large field enhancement that occurs within the nanoscale gaps between nanoparticles or at sharp tips and other asperities. Thus, metal nanoparticles and metamaterials can still be used for enhancing photodynamical and nonlinear processes. As such, optical metamaterials are better suited for light generation applications.
Interesting composites can be formed by integrating nonlinear, active or tunable elements into the metallic metamaterial inclusions, such that their properties are enhanced by the large local fields. However, the inherent response of the conduction electrons in metallic and semiconducting nanoparticles can be leveraged to obtain large nonlinearity and other effects, potentially without the need for additional materials.
Duration: 87 min.
|Appears in Series:||8.15:3 - Audio-visual Materials|
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