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Fano Enhancement of Raman Conversion
Date
2017-02-03
Author
Saatçi, Selen
Yıldız Karakul, Bilge Can
Bek, Alpan
Taşgın, Mehmet Emre
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https://hdl.handle.net/11511/73865
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Fano control of plasmonic double-resonant systems
Postacı, Selen; Bek, Alpan; Taşgın, Mehmet Emre; Department of Physics (2021-2-12)
The nonlinear response of plasmonic nanostructures can be enhanced as a result of the localization of the incident field into nm-size regions, called hot spots. The Raman signal of a molecule can be enhanced by adsorbing it to the surface of a plasmonic structure. However, the hot spot enhancement is limited with the modification of the vibrational modes, the breakdown of the molecule, and transition to the tunneling regime. The analytical treatment that is presented in this study aims to circumvent these l...
Fano enhancement of unlocalized nonlinear optical processes
Günay, Mehmet; Cicek, Ahmet; Korozlu, Nurettin; Bek, Alpan; TAŞGIN, MEHMET EMRE (2021-12-15)
Field localization boosts nonlinear optical processes at the hot spots of metal nanostructures. Fano resonances can further enhance these "local"processes taking place at the hot spots. However, in conventional nonlinear materials, the frequency conversion takes place along the entire crystal body. That is, the conversion process is "unlocalized."The path interference (Fano resonance) schemes developed for localized processes become useless in such materials. Here, we develop Fano enhancement schemes for un...
Fano lines in the reflection spectrum of directly coupled systems of waveguides and cavities: Measurements, modeling, and manipulation of the Fano asymmetry
Lian, Jin; Sokolov, Sergei; Yüce, Emre; Combrie, Sylvain; De Rossi, Alfredo; Mosk, Allard P. (2017-09-08)
We measured and analyzed reflection spectra of directly coupled systems of waveguides and cavities. The observed Fano lines offer insight on the reflection and coupling processes. Very different from side-coupled systems, the observed Fano line shape is not caused by the termini of the waveguide but by the coupling process between the measurement device fiber and the waveguide. Our experimental results and analytical model show that the Fano parameter that describes the Fano line shape is very sensitive to ...
Fano Resonances in the Linear and Nonlinear Plasmonic Response
Taşgın, Mehmet Emre; Bek, Alpan; Postacı, Selen (Springer, 2018-01-01)
Fano resonances manifest novel phenomena both in linear and nonlinear response of plasmonic nanomaterials. They can extend the lifetime of plasmonic excitations, enabling the operation of nanolasers, or they can increase the fluorescence of quantum emitters. They also provide control over nonlinear optical processes such as second harmonic generation and surface enhanced Raman scattering. Fano resonances can both enhance and suppress nonlinear response. Interference of two or more absorption/conversion path...
Fano-control of down-conversion in a nonlinear crystal via plasmonic-quantum emitter hybrid structures
Artvin, Zafer; Gunay, Mehmet; Bek, Alpan; TAŞGIN, MEHMET EMRE (The Optical Society, 2020-12-01)
Control of the nonlinear response of nanostructures via path interference effects, i.e., Fano resonances, has been studied extensively. In such studies, a frequency conversion process takes place near a hot spot. Here, we study the case where the frequency conversion process takes place along the body of a nonlinear crystal. Metal nanoparticle-quantum emitter dimers control the down-conversion process, taking place throughout the crystal body, via introducing interfering conversion paths. Dimers behave as i...
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S. Saatçi, B. C. Yıldız Karakul, A. Bek, and M. E. Taşgın, “Fano Enhancement of Raman Conversion,” 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/73865.