Sensing of an electromagnetic field with photon-assisted Fano resonance in 1D quantum dots

Photon-assisted Fano resonance in 1D quantum dots for sensing of an electromagnetic field (EF) is suggested. The EF is sensed with a $\Delta$-shape carbon nanotube junction. Such a $\Delta$- sensor involves two carbon nanotube sections C$_l$ and C$_r$ misaligned by a finite angle and attached to three normal metal leads N$_r$ ($r=1,2,3$). The Fano resonance originates from a photon- assisted indirect coupling between the quantized states in C$_l$ and C$_r$ via continuous states in N$_r$. The resonance results in series of singularities observed in the linear conductivity of the $\Delta$-sensor. The position and magnitude of the singularities is uniquely determined by the frequency, amplitude and polarization of the EF.