Phase-sensitive microwave optical double resonance in an N system

Abstract

PACS 42.50.Gy -Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption PACS 42.50.Ct -Quantum description of interaction of light and matter; related experiments Abstract -An experimental investigation of a Microwave Optical Double Resonance (MODR) phenomenon is carried out in a four level N system of 85 Rb atoms, at room temperature. This N system consists of a closed three level Λ subsystem irradiated with two optical fields and one microwave field. The MODR response is investigated in a separate probe field which drives a resonant transition from one of the ground states of the Λ system to a fourth level. We find that, under two-photon resonance condition for the optical fields, the MODR becomes a function of the relative phase between the beat frequency envelop of the optical fields and the microwave field. The variation in MODR is shown to be correlated with the phase-sensitive variation of the EIT phenomenon seen in such microwave-connected closed Λ systems. We envisage that this phasesensitive variation in the MODR, can be utilized for a phase-sensitive manipulation of non-linear optical phenomena in N systems.

Effects of temperature and ground-state coherence decay on enhancement and amplification in aΔatomic system

“…The symbols A, B, and C refer to regions of amplification, enhancement and absorption respectively. probe intensity has been observed when the microwave field was switched on compared to the value when the microwave field was switched off [12,13]. The increased transmitted intensity was still lower than the input probe intensity, hence no amplification.…”

“…Using realistic parameters, we present results of change in probe transmission for a system of 85 Rb atoms contained in a vapor cell of length L, for various values of T and for various rates of ground-state coherence decay (γ c ) using Eq. (13).…”

“…A study of slow and fast light propagation in a ∆ system [10] explicitly brought out the control on dispersive properties of such systems by the drive field. Experimental demonstration of both EIT [11,12] and associated non-linear effects [13] in ∆ systems of 85 Rb vapor has opened the possibility of demonstrating phasesensitive coherence-related effects in these systems.…”

Tuning the phase sensitivity of a double-lambda system with a static magnetic field

“…There has been a large amount of work in this field since the 1980s [5,6], and the interests boosted after the experimental demonstration of phase-sensitive EIT [7]. Applications of phase sensitive processes include large nonlinearity [8][9][10], slow and fast light [11][12][13], and optical switch [14] etc. To the best of our knowledge, it is a tradition to use oscillating electromagnetic fields, i.e., either all optical fields [7,[15][16][17][18], or a combination of microwave fields and optical fields [19][20][21], to form a closed loop.…”

Magnetic annihilation of the dark mode in a strongly coupled bright–dark terahertz metamaterial

“…In our case, coupling between the bright and dark resonators exerts a very strong and opposing magnetic field back on to the dark resonator thereby rendering it ineffective and results in a complete disappearance of the EIT peak. This observation is analogous to the effects in Delta()-type of atomic EIT systems [21,22], wherein the EIT peak can be modulated by enhancing or destroying dark state using the magnetic component of microwave field connecting the electric dipole forbidden transition of the atomic states. The proposed metamaterial design is illustrated in Fig.…”