Long wavelength infrared photodetector design based on electromagnetically induced transparency

Long wavelength enhanced Kerr nonlinearity via Fano-type interference in semiconductor quantum wells

“…The zeroth order solution of ρ 11 will be identical, i.e., ρ (0) 11 = 1, and other elements are set to zero. The first and third-order susceptibilities χ (1) and χ (3) of the medium can be determined by coherence terms ρ (1) 31 and ρ (1) 21 in Eq. 2a and ρ (3) 31 ρ (3) 21 in Eq.…”

“…Here, N is the atomic number density matrix in the medium. The linear dispersion and absorption are proportional to the real and imaginary parts of χ (1) , while, the real and imaginary parts of χ (3) determine the nonlinear dispersion i.e. Kerr nonlinearity and the nonlinear absorption.…”

“…A long wavelength infrared (IR) photo detector based on electromagnetically induced transparency (EIT) that is suitable for operation around room temperature and in the THz range has been proposed by Zyaei et al [1] It is known that strong lightmatter interactions in nonlinear optical materials have a crucial role in all-optical switching and optical communication. Thus, it is very important that one can enhance the Kerr nonlinearity at long wavelengths.…”

Proposal for all-optical controllable switch using dipole induced transparency (DIT)

“…Information transportation is difficult by these systems, but it is solved by using photons. So, in recent years many valuable works has been done on EIT, especially on solid state atomic systems with few photon levels, where multilevel nanocrystals are realized by quantum dots (QD) [5][6][7]. Theoretical and experimental research on QDs and multilevel atomic systems is on the frontier of research, which has seen rapid progress in the past several years.…”

Coherent laser-induced optical behaviors in three-coupled-quantum wells and their application to terahertz signal detection

“…Furthermore, their transition energies, dipole moments and symmetries can be engineered as desired by choosing the materials and structure dimensions in device design. Motivated by the analogy between QWs/CQWs and atoms as well as the inherent advantages of the former, several quantum optical coherence and interference effects have been investigated theoretically and experimentally in QWs and CQWs, for instance, gain without inversion [7][8][9], coherent population trapping (CPT) [10,11], electron ISBTs [12][13][14], ultrafast switching [15,16], slow light [17][18][19], electromagnetically induced transparency (EIT) [20][21][22][23][24] and tunneling-induced transparency (TIT) [25,26], optical bistability [27][28][29] and solitons [30][31][32], and so on. For practical applications, the idea of connecting coherence quantum control to the quantum optical behaviors with the ultra-small world of nanosize systems like QWs/CQWs with desirable properties and wavelengths is very promising.…”