A5038621275- Advanced Fiber Laser Technologies
- Quantum Mechanics and Non-Hermitian Physics
- Nonlinear Photonic Systems
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Photorefractive and Nonlinear Optics
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Ultra-Wideband Communications Technology
- Quantum optics and atomic interactions
- Electromagnetic Simulation and Numerical Methods
- Geophysics and Sensor Technology
Shanghai Jiao Tong University
2022-2025
Perfect absorption of light critically affects light-matter interaction for various applications. Coherent perfect absorbers (CPAs) gain the unique capability controlling with in a linear fashion. Multicolor CPAs [S. Longhi, Time-reversed optical parametric oscillation, Phys. Rev. Lett. 107, 033901 (2011)PRLTAO0031-900710.1103/PhysRevLett.107.033901] are highly desirable broadband and nonlinear light-to-light coherent control but experimental demonstration has still remained elusive. Here,...
Non-Hermitian degeneracies reveal intriguing and non-trivial behaviors in open physical systems. Examples like Parity-Time (PT) symmetry breaking, topological encircling chirality, enhanced sensing near an exceptional point (EP) are often associated with the abrupt nature of phase transition around these degeneracies. Here we experimentally observe a cavity-enhanced second-harmonic frequency (SHG) conversion on PT line, i.e. set consisting open-ended isofrequency or isoloss lines, both...
Photons with zero rest mass are impossible to be stopped. However, a pulse of light can slowed down and even halted through strong light-matter interaction in dispersive medium atomic systems. Exceptional point (EP), non-Hermitian singularity point, introduce an abrupt transition dispersion. Here we experimentally observe room-temperature storing near exceptional induced by nonlinear Brillouin scattering chip-scale 90-μm-radius optical microcavity, the smallest platform up date store light....
Abstract Transparency and perfect absorption are two contradictory terms; a absorber never permits waves to transmit through. However, this statement only remains true in the linear regime, where nonlinearity has been omitted physical system like is not affected by incoming waves. Here we experimentally demonstrate an intriguing self-induced transparency effect perfectly absorbing optical microcavity, which absorbs any at low power level, but allows portion of be transmitted higher due...
Exceptional points (EPs), universally present in non-Hermitian systems, often reveal some critical behaviors such as topological encircling chirality and ultrahigh enhanced sensing near singularities. However, most of the experimental realizations EPs have been limited to linear regime, where system nonlinearity has omitted. Here, we experimentally observe two distinct with opposite hermiticities demonstrate a parity–time phase transition exotic memory effects nonlinear based on stimulated...
Subwavelength gratings play a fundamental and pivotal role in numerous science applications for wave manipulation, exhibiting distinctive features such as filtering, phase anti-reflection. However, conventional fabrication methods ultrasmall periodic structures are constrained by the optical diffraction limit, making it challenging to produce subwavelength optics. Here, we demonstrate novel technique build reconfigurable photorefractive grating (SPG) thin-film lithium niobate on platform of...
Two coupled resonance modes can lead to exotic transmission spectra due internal interference processes. Examples include electromagnetically induced transparency (EIT) in atoms and mode splitting optics. The ability control individual plays a crucial role controlling such for practical applications. Here we experimentally demonstrate controllable EIT-like single microcavity using double-port excitation. caused by coupling between two counter-propagating resonances be effectively controlled...
Abstract Subwavelength gratings play a fundamental and pivotal role in numerous science applications for wave manipulation, exhibiting distinctive features such as filtering, phase anti‐reflection. However, conventional fabrication methods ultrasmall periodic structures are constrained by the optical diffraction limit, making it challenging to produce subwavelength optics. Here, novel technique is demonstrated build reconfigurable photorefractive grating (SPG) thin‐film lithium niobate on...
Perfect absorption of light critically affects light-matter interaction for various applications. Coherent perfect absorbers (CPA) gain the unique capability controlling with in a linear fashion. Multi-color CPAs [Phys. Rev. Lett. 107, 033901] are highly desirable broadband and nonlinear light-to-light coherent control, however, experimental demonstration has still remained elusive. Here we experimentally observe dual-color version CPA (DC-CPA) through second harmonic generation single...
The photorefractive (PR) effect plays a critical role in emerging photonic technologies, including dynamic volume holography and on-chip all-optical functionalities. Nevertheless, its slow response rate has posed significant obstacle to practical application. Here, we experimentally demonstrate the enhancement of PR high-Q thin-film lithium niobate (TFLN) microdisk under UV light irradiation. At an irradiation intensity 30 mW/cm 2 , achieves high bandwidth approximately 256 kHz. By employing...
Non-Hermitian degeneracies reveal intriguing and nontrivial behaviors in open physical systems. Examples like parity-time (PT) symmetry breaking, topological encircling chirality, enhanced sensing near an exceptional point (EP) are often associated with the abrupt nature of phase transition around these degeneracies. Here we experimentally observe a cavity-enhanced second-harmonic frequency (SHG) conversion on PT line, i.e., set consisting open-ended isofrequency or isoloss lines, both...