Effect of Magnetic Field on Resonant Properties of Plasmon-Polariton Photodetectors

The influence of magnetic field action on $\boldsymbol{\Psi}(\boldsymbol{\lambda})$ and $\Delta(\lambda)$ dependencies at different magnetic flux density (100 and 300 mT) and magnetic field direction: $\vec{B} \uparrow \uparrow \vec{n}; \vec{B} \uparrow \downarrow \vec{n}; \vec{B} \perp$ $\vec{n}, \vec{B}$ and $\vec{E}$ are collinear, $\vec{B} \perp \vec{n}, \vec{B}$ and $\vec{E}$ are not collinear, where $\overrightarrow{\boldsymbol{n}}$ - is normal vector to the sample’s surface, for mentioned plasmon-polariton photodetectors were investigated. It was obtained, that magnetic field action results in both blue shift and altitude of characteristic SPR peaks of the structures under investigations. It was founded that in configuration $\vec{B} \perp$ $\overrightarrow{\boldsymbol{n}}, \vec{B}$ and $\vec{E}$ are collinear noted effect was the most pronounced. For the certain experimental configuration $\vec{B}, \vec{n}$ and $\vec{E}$ the effect was enhanced with a decrease of the angle of incidence, and for the smallest angle in our experiment $\left(20^{\circ}\right)$, it was most pronounced. Possible physical mechanisms of observed phenomena are discussed. The results can open up new opportunities in the design of optoelectronic sensors of the magnetic field or high-speed optical modulators.