Asymmetric diffraction grating via optical vortex light in a tunneling quantum dot molecule

Abstract

In this letter, we have put out a fresh idea for managing the diffraction sample of optical vortex light that was transmitted from a four-level quantum dot molecule. We describe the creation of a new weak laser field via inter-dot tunneling, which causes the diffraction grating to be dependent on the orbital angular momentum (OAM) of the optical vortex light. We found that the relative phase between the implemented lights and the OAM number of the vortex light affect the intensity distribution of the asymmetric grating. Additionally, we discovered that the maximum amount of probe energy could be dispersed in higher orders of diffracted angles that were negative and positive by modifying the inter-dot tunneling and OAM number.

Efficient two-dimensional Fraunhofer diffraction pattern via electron spin coherence

“…Moreover, recent research has also explored the enhancement of EIG phase modulation through nonlinear polarization [29,30]. Presently, cuttingedge research in the EIG field is focused on implementing gratings within optical parity-time symmetric cold atomic media, thereby producing an asymmetric diffraction pattern [23,[31][32][33]. In recent times, semiconductor nanostructure devices, including quantum dots and quantum wells, have been considered as noteworthy candidates for controlling and manipulating optical properties, despite atomic systems being satisfactory alternatives [34][35][36][37][38][39][40][41][42].…”

Operating mode dependent energy transfer efficiency in a quantum well waveguide

“…Semiconductors have been shown to exhibit EIT through intersubband transitions [36], electron spin coherence (ESC) in a quantum well waveguide [37][38][39][40][41][42], and nonradiative quantum coherences [39]. Such quantum coherence can be harnessed to observe various quantum phenomena in semiconductors, such as gain without inversion, coherent control of absorption and dispersion, and FWM, all made possible by intersubband optical transitions [43][44][45][46][47][48][49][50][51].…”

Tunneling induced swapping of orbital angular momentum in a quantum dot molecule

“…In recent years, with the emergence of new materials, i.e. quantum wells (QWs) and quantum dots (QDs) [15][16][17][18], researchers have paid much attention to the FWM process in these materials because of their excellent properties [19,20]. These structures have large electric dipole moments, small effective electric mass, and highly nonlinear optical coefficients in comparison to atomic systems [21][22][23].…”