Uniform phase modulation via control of refractive index in a thermal atom vapor with vanishing diffraction or absorption

Abstract

A scheme is proposed to achieve substantial controllable phase modulation for a probe field propagating through a thermal atomic vapor in double-Λ configuration. The phase modulation is based on the linear susceptibility of the probe field, paraxial diffraction is eliminated by exploiting the thermal motion of atoms, and residual absorption is compensated via an incoherent pump field. As a result, a strong controllable uniform phase modulation without paraxial diffraction is achieved essentially independent of the spatial profile or the intensity of the probe field. This phase shift can be controlled via the intensities of the control or the incoherent pump fields. A possible proof-ofprinciple experiment in alkali atoms is discussed.

Tunable subluminal and superluminal light with optomechanical-induced transparency under steady-state configuration

“…Parallel to the phenomenon of perfect absorption in linear dielectrics [8][9][10][11], a phenomenon known as inverse EIT in an optomechanical system is also reported in which the light is completely confined in the cavity with no output field [12]. Other related optical phenomenon that can be explored in the context of optomechanical system include stimulated Raman adiabatic passage [13][14][15], refractive index enhancement [16][17][18], Fano resonances [3,19,20] and nano-optic resonators [21]. When a cavity is driven by a strong pump field, the coupling of its modes with mechanical resonator can be increased, and the rate of such increase depends on the average photon number in the cavity [22].…”

Enhancement of the Goos-Hänchen shift in an optomechancal cavity via Casimir force

“…The optomechanical system has many applications in various research areas such as slow light propagation in optomechanically induced transparency (OMIT) [27][28][29][30][31][32][33], accurate measurement of atom localization [34,35], quantum information [36,37], control of light propagation [38,39], light squeezing [40] and coupling physics [41]. The cavity optomechanics contains many phenomena such as electromagnetically induced transparency (EIT) [42], inverse EIT [43], Fano-like shape [44], refractive-index enhancement [45] and nano-scale cavities [46]. Using different atomic systems, double or triple EIT have been reported such as V-type [47], Y-type [48], N-type [49] and K type [50] atomic structures.…”

Tunable fast and slow light in a hybrid optomechanical system

“…In recent years, tremendous progress in new methods for pulse propagation and properties of optical media have been reported in optomechanics. The rapidly emerging field has become a playground to study electromagnetically induced transparency (EIT) [1], inverse EIT [2], stimulated Raman adiabatic passage [3], refractive index enhancement [4,5], Fano resonances [6][7][8], microscopy [9], photonic crystals [10], and nano-optic resonators [11]. In this paper, we explain the phenomena of parametrically controlled fast (superluminal) light and slow (subluminal) light in hybrid optomechanics, which is of considerable interest in view of its potential impact on present-day photonic technology [12][13][14][15][16].…”