964 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- City University of New YorkUS213 papers
- The Graduate Center, CUNYUS199 papers
- American Museum of Natural HistoryUS39 papers
- California Institute of TechnologyUS37 papers
- University of Massachusetts AmherstUS36 papers
- Princeton UniversityUS29 papers
- Space Telescope Science InstituteUS26 papers
- Centre National de la Recherche ScientifiqueFR18 papers
- Johns Hopkins UniversityUS17 papers
- Yale UniversityUS16 papers
- City College of New YorkUS15 papers
- Jet Propulsion LaboratoryUS15 papers
35 papers · 1 filter
Two-media laser threshold magnetometry: A magnetic-field-dependent laser threshold
Yves Rottstaedt, Lukas Lindner, Florian Schall +9
Nitrogen-vacancy (NV) centers in diamond are a promising platform for high-precision magnetometry. In contrast to the use of spontaneous emission in a number of NV-magnetometers, l…
Subwavelength Photorefractive Grating in a Thin-Film Lithium Niobate Microcavity
Jiankun Hou, Jiefu Zhu, Ruixin Ma +9
Subwavelength gratings play a fundamental and pivotal role in numerous science and applications for wave manipulation, exhibiting distinctive features such as filtering, phase mani…
Effective size of a parity-time symmetric dimer
Li Ge
Parity-time (PT) symmetric dimers were introduced to highlight the unusual properties of non-Hermitian systems that are invariant after a combined parity and time reversal operatio…
Enhanced Frequency Conversion in Parity-Time Symmetry Line
Jiankun Hou, Jiefu Zhu, Ruixin Ma +9
Non-Hermitian degeneracies reveal intriguing and non-trivial behaviors in open physical systems. Examples like Parity-Time (PT) symmetry breaking, topological encircling chirality,…
Robust zero modes in non-Hermitian systems without global symmetries
Jose D. H. Rivero, Courtney Fleming, Bingkun Qi +2
We present an approach to achieve zero modes in lattice models that do not rely on any symmetry or topology of the bulk, which are robust against disorder in the bulk of any type a…
Non-Hermitian gauged laser arrays with localized excitations: Anomalous threshold and generalized principle of selective pumping
Li Ge, Zihe Gao, Liang Feng
We investigate non-Hermitian skin modes in laser arrays with spatially localized excitation. Intriguingly, we observe an unusual threshold behavior when selectively pumping either…
Synthetic parity-time symmetry breaking in a single microcavity
Fangxing Zhang, Yaming Feng, Li Ge +1
Non-Hermitian systems based on parity-time (PT) symmetry reveal rich physics beyond the Hermitian regime. So far, realizations of PT-symmetric systems have been limited to the spat…
Time-reversal invariant scaling of light propagation in one-dimensional non-Hermitian systems
Jose Hernandez Rivero, Li Ge
Light propagation through a normal medium is determined not only by the real part of the refractive index but also by its imaginary part, which represents optical gain and loss. Th…
Optical fluxes in coupled -symmetric photonic structures
Li Ge, Konstantinos G. Makris, Lingxuan Zhang
In this work we first examine transverse and longitudinal fluxes in a -symmetric photonic dimer using a coupled-mode theory. Several surprising understandings are obtained…
Defect states emerging from a non-Hermitian flat band of photonic zero modes
Bingkun Qi, Lingxuan Zhang, Li Ge
We show the existence of a flat band consisting of photonic zero modes in a gain and loss modulated lattice system, as a result of the underlying non-Hermitian particle-hole symmet…
Contrasting Spectral Signatures and Sensitivities of CPA-Lasing in a -Symmetric Periodic Structure
Li Ge, Liang Feng
The CPA-laser is a coexisting state of coherent perfect absorption and lasing that was proposed in parity-time () symmetric photonic systems. In this work we show that the…
Symmetry, stability, and computation of degenerate lasing modes
David Liu, Bo Zhen, Li Ge +6
We present a general method to obtain the stable lasing solutions for the steady-state ab-initio lasing theory (SALT) for the case of a degenerate symmetric laser in two dimensions…
Symmetry-protected zero-mode laser with a tunable spatial profile
Li Ge
We propose to utilize symmetry-protected zero modes of a photonic lattice to realize a single-mode, fixed-frequency, and spatially tunable laser. These properties are the consequen…
Non-Hermitian engineering of single mode two dimensional laser arrays
Mohammad H. Teimourpour, Li Ge, Demetrios N. Christodoulides +1
A new scheme for building two dimensional laser arrays that operate in the single supermode regime is proposed. This is done by introducing an optical coupling between the laser ar…
Condensation of Thresholds in Multimode Microlasers
Li Ge, Hui Cao, A. Douglas Stone
We show from ab initio laser theory that by choosing an appropriate spatial pump profile, many different spatial modes of a typical microlaser can be turned on at the same pump ene…
Experimental demonstration of spontaneous chirality in a nonlinear microresonator
Qi-Tao Cao, He-Ming Wang, Chun-Hua Dong +6
Chirality is an important concept that describes the asymmetry property of a system, which usually emerges spontaneously due to mirror symmetry breaking. Such spontaneous chirality…
Optical Reciprocity Induced Symmetry of the Scattering Eigenstates in Non--Symmetric Heterostructures
Li Ge, Liang Feng
The scattering matrix obeys the unitary relation in a Hermitian system and the symmetry property in a Parity-Time () sym…
Anomalous Parity-Time Symmetry Transition away from an Exceptional Point
Li Ge
Parity-time (PT) symmetric systems have two distinguished phases, e.g., one with real energy eigenvalues and the other with complex conjugate eigenvalues. To enter one phase from t…
Nonlinear modal interactions in parity-time () symmetric lasers
Li Ge, Ramy El-Ganainy
Parity-time () symmetric lasers have attracted considerable attention lately due to their promising applications and intriguing properties, such as free spectral range dou…
Scattering in and Symmetric Multimode Waveguides: Generalized Conservation Laws and Spontaneous Symmetry Breaking beyond One Dimension
Li Ge, Konstantinos G. Makris, Demetrios N. Christodoulides +1
We extend the generalize conservation law of light propagating in a one-dimensional -symmetric system, i.e., for the transmittance and the reflec…
Anomalous minimum and scaling behavior of localization length near an isolated flat band
Li Ge
Using one-dimensional tight-binding lattices and an analytical expression based on the Green's matrix, we show that anomalous minimum of the localization length near an isolated fl…
Parity-time symmetry in a flat band system
Li Ge
In this paper we introduce Parity-Time () symmetric perturbation to a one-dimensional Lieb lattice, which is otherwise -symmetric and has a flat band. In the flat…
Interaction-induced mode switching in steady-state microlasers
Li Ge, David Liu, Alexander Cerjan +5
We demonstrate that due to strong modal interactions through cross-gain saturation, the onset of a new lasing mode can switch off an existing mode via a negative power slope. In th…
Inverse Vernier Effects in Coupled Lasers
Li Ge, Hakan E. Tureci
In this report we study the Vernier effect in coupled laser systems consisting of two cavities. We show that depending on the nature of their coupling, not only can the "supermodes…