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7 papers · 2 filters
Ab initio derivation of multipolar expansion of optical force
Yikun Jiang, Jack Ng, Zhifang Lin
Like many other physical quantities, the optical force can be expanded using multipole expansion, which has been done in [Nat. Photon. 5, 531], up to electric octupole order. Howev…
Universal relationships between optical force/torque and orbital versus spin momentum/angular momentum of light
Yikun Jiang, Huajin Chen, Jun Chen +2
We establish universal relationships between optical force/torque on a general particle and different parts of linear and angular momentum (AM) of generic monochromatic optical fie…
Anti-Parity-Time Symmetric Optics via Flying Atoms
Peng Peng, Wanxia Cao, Ce Shen +4
The recently-developed notion of 'parity-time (PT) symmetry' in optical systems with a controlled gain-loss interplay has spawned an intriguing way of achieving optical behaviors t…
Tailor the functionalities of metasurfaces: From perfect absorption to phase modulation
Che Qu, Shaojie Ma, Jiaming Hao +8
Metasurfaces in metal/insulator/metal configuration have recently been widely used in photonics research, with applications ranging from perfect absorption to phase modulation, but…
Optical force on toroidal nanostructures: toroidal dipole versus renormalized electric dipole
Xu-Lin Zhang, S. B. Wang, Zhifang Lin +2
We study the optical forces acting on toroidal nanostructures. A great enhancement of optical force is unambiguously identified as originating from the toroidal dipole resonance ba…
Direct Observationof DegenerateTwo-Photon Absorption and Its Saturation in WS2 and MoS2 Monolayer and Few-Layer Films
Saifeng Zhang, Ningning Dong, Niall McEvoy +10
The optical nonlinearity of WS2, MoS2 monolayer and few-layer films was investigated using the Z-scan technique with femtosecond pulses from the visible to the near infrared. The d…