Photonic spin Hall effect with high coupling efficiency in the combined structure of periodic dielectric waveguides and photonic crystal waveguide

Abstract

In this paper, we discuss the Photonic Spin Hall Effect (PSHE) in the combined structure of Periodic Dielectric Waveguides (PDWs) and Photonic Crystal Waveguide (PCW). By controlling the polarization of the dipole source, we have successfully achieved the arbitrary manipulation of PSHE for the PDW guided mode in our structure. The advantage of PDW is that it can be designed to different shapes without the geometric constraints, and still maintains a relatively high transmission rate. Therefore, by further changing the structure, including the adjustment of the intersection angle between PDW and PCW, and the alteration of the straight PDW to the bending or bifurcated shapes, we find that the output of highly unidirectional PSHE is mainly determined by the intersection angle between PDW and PCW and almost independent of the detailed shape of PDW.

Tunable atomic spontaneous radiation in cylindrical waveguide

“…in which J L and J R are the time-average energy of the waveguide modes in the left and right channels respectively [11]. Finally, we find that the corresponding contrast ratio is 0.9932 for figure 2(c).…”

“…More recently, a newer interpretation, known as Component Wave Interference (CWI) theory, provides an alternative perspective. This theory shows that unidirectional propagation is the result of the interference between spatial odd and even modes excited by different components of the incident beam [8][9][10][11][12], which clearly disclosed the physical mechanism of PSHE. With the * Author to whom any correspondence should be addressed.…”

“…Recently, the chiral interaction between light and matter provides a new method for quantum control, in which the radiation direction of atom depends on the polarization of the atomic dipole moment. In fact, the so-called photonic spin Hall effect (PSHE), which modulates unidirectional propagation and unidirectional radiation by using the spin characteristics of light, has been deeply studied in various nano photonic structures, including metal surfaces, optical fibers, semiconductor waveguides, microresonators and topological nanostructures [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Meanwhile, the spin-momentum locking is the most popular theoretical explanation for the mechanism of PSHE [21,22].…”

“…With the * Author to whom any correspondence should be addressed. use of CWI theory, the controllable propagation of waveguide modes in multi-channel waveguides can be achieved [9][10][11][23][24][25].…”

“…However, previous reports on PSHE have been relatively simple, primarily focusing on the directional propagation of a single-mode in two-dimensional configurations [8][9][10][11][12][23][24][25]. While these studies have provided valuable insights, the chiral interactions between atoms and waveguide modes remain an underexplored domain.…”