Plasmonic Sensing and Modulation Based on Fano Resonances

Abstract

The rapid developments in nanotechnology and plasmonics allow the manipulation of light at nanometer scales, such as light propagation and resonances. Differing from the symmetric Lorentzian‐like profiles in the conventional resonances, Fano resonances, which originate from the interference of different resonant modes, exhibit obviously asymmetric spectral profiles. Based on lineshape engineering, the Fano resonances with sharp asymmetric profiles exhibit a small linewidth and a high spectral contrast by exploiting different mechanisms and designing various metallic nanostructures. Both of the above properties in the sharp Fano resonances have significant applications in nanoscale plasmonic sensors and modulators. This review summarizes the underlying mechanism of the Fano resonances in various metallic nanostructures. Then, practical applications of the Fano resonances in nanoscale plasmonic sensing and modulation are reviewed. At last, the development and challenges of plasmonic sensing and modulation based on Fano resonances are discussed.

Directional Fano Resonance in an Individual GaAs Nanospheroid

“…Fano resonance, a type of resonant scattering phenomenon which results in an asymmetric line‐shape, has been widely studied in the half past century . It promises applicability in a number of photonic devices, such as optical switches, filters, sensors, and so on. To date, Fano resonance has been achieved by various nanostructures like photonic crystals, plasmonic materials, and metamaterials .…”

THz Sensing With Anomalous Extraordinary Optical Transmission Hole Arrays

“…Interestingly, the high field intensity near the subwavelength apertures at the EOT resonance has been exploited for sensing applications [ 11 , 12 , 13 ] and nowadays one can find in the literature several examples of EOT biosensors [ 14 ], sensors combining nanofluidics and nanoplasmonics [ 15 ], and even sensing platforms for a direct detection and monitoring of viruses [ 16 ]. There are excellent reviews in the recent literature accounting for the latest progress in this exciting and expanding topic [ 17 , 18 , 19 , 20 ].…”

Two-Way Fano Resonance Switch in Plasmonic Metamaterials

“…The Fano interference is a universal phenomenon because the manifestation of configuration interference does not depend on the matter [2], which has been realized in many systems, such as photonic crystals [3], plasmonic nanostructures [4][5][6][7][8][9], metamaterials [10][11][12][13], plasmonic metamaterials [14][15][16], etc. Fano resonance may be used for the design of spin filters [17], switches [18], chemical or biological sensors [19][20][21][22][23][24][25][26], etc.…”