| Autor: |
Rasskazov, Ilia L., Moroz, Alexander, Murphy, Catherine J., Krauss, Todd D., Carney, P. Scott |
| Rok vydání: |
2022 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| Popis: |
A novel concept of a \textit{mesocavity}, based on a simple yet counter-intuitive idea of covering metal nanoparticles with unusually thick ($\gtrsim 100$ nm) high-index dielectric shells, is demonstrated in technologically relevant and largely sought-after case of an upconversion (UC) enhancement. For readily available combinations of materials and geometrical parameters of metal-dielectric core-shell mesocavity, record high values of UC enhancement of $\gtrsim 10^6$ can be achieved on the cavity surface. For emitter inside the high-index dielectric shell with refractive index $n=2.7$, the Lorentz local-field correction can provide an additional enhancement factor for UC of $\approx 92$, resulting in UC enhancement of $\gtrsim 10^8$, which is three orders of magnitude larger than it has ever been reported for individual particles. Our mesocavity concept facilitates a beneficial synergy of plasmonic and whispering gallery-mode resonance functionalities within an intermediary region between nanoscale ($\lesssim 100$ nm) and microscale ($\gtrsim 1$ $\mu$m). |
| Databáze: |
arXiv |
| Externí odkaz: |
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