2021/09/04 by Jeng Yi Lee, Lee, Jeng Yi, Pai‐Yen Chen +2
Mathematics · Physics and Astronomy · #Classical mechanics #FOS: Physical sciences #Geometry #Mathematics #Mechanical and Optical Resonators #Null (SQL) #Optical force #Optical tweezers #Optics #Optics (physics.optics) #Optomechanics #Phase (matter) #Physics #Plane wave #Quantum Mechanics and Non-Hermitian Physics #Quantum mechanics #Symmetry (geometry) #Topological Materials and Phenomena #physics.optics
paper · pdf · doi:10.48550/arxiv.2109.01777
arxiv created 2021/09/04 · openalex publication_date 2021/09/04 · arxiv updated 2021/09/07 · openalex created_date 2021/09/13 · openalex updated_date 2026/07/28
We discuss the optical forces exerted on parity-time (PT) symmetric heterostructures under normal incidence of a single and two counter-propagating plane waves. The underlying strategy is through generalized parametric space, stemming from consideration of PT-symmetry condition and Lorentz reciprocity theorem. In such a generalized parametric space, we are able to not only exhaustively indicate various PT phases and extraordinary wave phenomena, but also deduce the directionality and magnitudes of optical forces. We find that when the system is illuminated by a normally incident wave, it can exhibit the symmetric pushing effect in the exact symmetry phase, uni-directional null (UNF) and bi-directional null force (BNF) at the exceptional point (EP), and pulling-pushing flipped forces in the broken symmetry phase, with BNF found at the pushing-pulling turning point. In two counter-propagating plane waves interference, the magnitudes as well as the directionality of resultant optical force can be tuned by relative phase of incident waves. More interestingly, we observe that there has a null force independent of the relative phase occurred in a specific region of broken symmetry phase and exceptional point. In addition, we offer several PT-symmetric heterostructures to support our findings. Our results may be beneficial for applications in PT optomechanics and force rectifiers.