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Tuning of the mode wavelength by adjusting the vertical length of the cavity. The distance between the DBRs is adjusted by changing the applied voltage on the piezo-nanopositioner. The figure shows a PL map obtained for such length tuning for the cavity containing a monolayer MoS2 film. PL of the modes is observed in a wide spectral range overlapping with the PL of the MoS2 film: the mode PL is enhanced when in resonance with MoS2 emission.
