We present high-resolution, all-optical thermometry based on ensembles of germanium-vacancy (GeV) color center in diamond and implement this method of thermometry in the fiber-optic format. Due to the unique properties of diamond, an all-optical approach using this method opens a way to produce back-action-free temperature measurements with resolution below 0.1 K in a wide range of temperatures.
Nanoplasmonic
systems
combined with optically active two-dimensional
materials provide intriguing opportunities to explore and control
light–matter interactions at extreme subwavelength length scales
approaching the exciton Bohr radius. Here, we present room- and cryogenic-temperature
investigations of a MoSe2 monolayer on individual gold
dipole nanoantennas. By controlling nanoantenna size, the dipolar
resonance is tuned relative to the exciton achieving a total tuning
of ∼130 meV. Differential reflectance measurements performed
on >100 structures reveal an apparent avoided crossing between
exciton
and dipolar mode and an exciton–plasmon coupling constant of g = 55 meV, representing g/(ℏω
X
) ≥ 3%
of the transition energy. This places our hybrid system in the intermediate-coupling
regime where spectra exhibit a characteristic Fano-like shape. We
demonstrate active control by varying the polarization of the excitation
light to programmably suppress coupling to the dipole mode. We further
study the emerging optical signatures of the monolayer localized at
dipole nanoantennas at 10 K.
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