Control of slow light in three- and four-level graphene nanostructures

Abstract

Graphene nanomaterials exhibit excellent optical properties when interacting with electromagnetical fields, which plays an important role in a wide range of applications such as optical communications, optical storage and other fields. Based on the electromagnetically induced transparency (EIT) effect, we investigate control of slow light in the Landau quantized graphene system with different three-level and four-level coupling schemes. Utilizing the EIT effect, group velocity of the probe fields can be significantly reduced and well controlled by manipulating Rabi frequencies and detunings of the coupling lasers as well as probe detuning. Furthermore, probe light with different frequencies can even be controlled in different EIT windows in the graphene system with the four-level scheme, which may find applications in signal selection and discrimination. This work can provide reference for the design of graphene-based quantum devices and have potential applications in optical communications and optical quantum information processing, etc.

T-shaped reflective polarizer under second Bragg incidence

“…The polarizer [1][2][3][4][5] can split the incident light into two mutually orthogonal polarized lights, which plays an important role in the field of terahertz devices [6], infrared telecom [7], information technology [8], information processing [9][10][11], imaging [12][13][14][15], optical storage [16][17][18][19], and polarization detection of light [20][21][22][23]. The conventional polarization separators are usually based on the birefringence of crystal, and the size is generally in the order of millimeter.…”

Four equal-intensity laser output and physical analysis generated by reflective grating with a silver plate

“…Power splitters [5][6][7][8] are also part of many optical devices, such as wavelength multiplexers [9][10][11][12], optical switches [13][14][15][16], etc. They are widely used in the fields of optical fiber communication [17][18][19][20][21], optical image processing [22][23][24] and optical storage [25,26]. The diffraction order of the beam splitter is related to the incident wavelength and the period of the grating.…”