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Novel Plasmonic Nanocavities for Optical Trapping‐Assisted Biosensing Applications
Author(s) -
Koya Alemayehu Nana,
Cunha Joao,
Guo TianLong,
Toma Andrea,
Garoli Denis,
Wang Tao,
Juodkazis Saulius,
Cojoc Dan,
Proietti Zaccaria Remo
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901481
Subject(s) - plasmon , materials science , optical tweezers , trapping , tweezers , nanotechnology , nanoparticle , plasmonic nanoparticles , biosensor , optoelectronics , surface enhanced raman spectroscopy , raman spectroscopy , optics , raman scattering , physics , ecology , biology
Plasmonic nanocavities have proved to confine electromagnetic fields into deep subwavelength volumes, implying their potentials for enhanced optical trapping and sensing of nanoparticles. In this review, the fundamentals and performances of various plasmonic nanocavity geometries are explored with specific emphasis on trapping and detection of small molecules and single nanoparticles. These applications capitalize on the local field intensity, which in turn depends on the size of plasmonic nanocavities. Indeed, properly designed structures provide significant local field intensity and deep trapping potential, leading to manipulation of nano‐objects with low laser power. The relationship between optical trapping‐induced resonance shift and potential energy of plasmonic nanocavity can be analytically expressed in terms of the intercavity field intensity. Within this framework, recent experimental works on trapping and sensing of single nanoparticles and small molecules with plasmonic nanotweezers are discussed. Furthermore, significant consideration is given to conjugation of optical tweezers with Raman spectroscopy, with the aim of developing innovative biosensors. These devices, which take the advantages of plasmonic nanocavities, will be capable of trapping and detecting nanoparticles at the single molecule level.