  Nanoscale pulsed light is highly desirable in nano-integrated optics. In this
letter, we obtained femtosecond pulses with THz repetition frequency via the
strong coupling between quantum emitters (QEs) and plasmonic resonators. Our
structure consists of a V-groove (VG) plasmonic resonator and a nanowire
embedded with two-level QEs. The influences of the incident light intensity and
QE number density on the transmission response for this hybrid system are
investigated through semi-classical theory and simulation. It is found that the
transmission response can be modulated to the pulse form. The reason is the
strong coupling causes the output power of nanowire to behave as an oscillating
form, the oscillating output power in turn causes the field amplitude in the
resonator to oscillate over time. A feedback system is formed between the
plasmonic resonator and the QEs in nanowire. This provides a new method for
generating narrow pulsed lasers with ultrahigh repetition frequency in
plasmonic systems using a continous wave input, which has potential
applications in generating optical clock signals at the nanoscale.
