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home » physics and technology of light » 4.electromechanical terahertz emitters
4. Electromechanical Terahertz emitters: Contact person: Alessandro Pitanti Our research activity focuses on embedding mechanically actuable objects within a QCL resonant cavity. By exploiting recent results in which lasing action has been reported for ultrasmall cavities inspired by LC resonant circuits, we are developing suspended metallic elements whose vibration directly modifies the effective circuit inductance and therefore the cavity resonant frequency. The mutual interaction of light and vibrations can be used both to control the vibrational state of the inductance and to influence the intracavity photon dynamics.
Combining the optimal photonic properties of the whispering gallery mode (WGM) microdisk resonators and the efficient radiation patterns provided by metallic antennas, subwave length THz microresonators have been realized, displaying extremely low laser thresholds in continuous-wave and in a very regular beam profile.Sci. Adv., 3, e1603317 (2017)
(left) I-V and L-I characteristics of the dipole-antenna THz laser. In the inset the emission spectrum is shown, with a strong dominance of the vertically emitting mode. (right) Measured far-field map. Simulated data is overimposed with dashed white lines. L. Masini, A. Pitanti, L. Baldacci, M. S. Vitiello, R. Degl’Innocenti,H. E. Beere, D. A. Ritchie and A. TredicucciContinuous-wave laser operation of a dipole antenna terahertz microresonator, Light Sci. App., 86, e17054 (2017)