832 citations · 3.1k across the 39 of their papers we have counts for
41 papers
Realizing efficient topological temporal pumping in electrical circuits
Alexander Stegmaier, Hauke Brand, Stefan Imhof +11
Quantized adiabatic transport can occur when a system is slowly modulated over time. In most realizations however, the efficiency of such transport is reduced by unwanted dissipati…
Electrically-Controlled Suppression of Rayleigh Backscattering in an Integrated Photonic Circuit
Ogulcan E. Orsel, Jiho Noh, Gaurav Bahl
Undesirable light scattering is an important fundamental cause for photon loss in nanophotonics. Rayleigh backscattering can be particularly difficult to avoid in wave-guiding syst…
Electro-optic non-reciprocal polarization rotation in lithium niobate
Oğulcan E. Örsel, Gaurav Bahl
Polarization is a fundamental degree of freedom for light and is widely leveraged in free space and fiber optics. Non-reciprocal polarization rotation, enabled via the magneto-opti…
Higher rank chirality and non-Hermitian skin effect in a topolectrical circuit
Penghao Zhu, Xiao-Qi Sun, Taylor L. Hughes +1
While chirality imbalances are forbidden in conventional lattice systems, non-Hermiticity can effectively avoid the chiral-doubling theorem to facilitate 1D chiral dynamics. Indeed…
Frequency Response and Eddy Current Power Loss in Magneto-Mechanical Transmitters
Jiheng Jing, Sameh Tawfick, Gaurav Bahl
Magneto-mechanical transmitters offer a compact and low-power solution for the generation of ultra-low frequency (ULF) magnetic signals for through-ground and through-seawater comm…
Photonic quadrupole topological insulator using orbital-induced synthetic flux
Julian Schulz, Jiho Noh, Wladimir A. Benalcazar +2
The rich physical properties of multiatomic molecules and crystalline structures are determined, to a significant extent, by the underlying geometry and connectivity of atomic orbi…
Spontaneously-Induced Dirac Boundary State and Digitization in a Nonlinear Resonator Chain
Gengming Liu, Jiho Noh, Jianing Zhao +1
The low-energy excitations in many condensed matter and metamaterial systems can be well described by the Dirac equation. The mass term associated with these collective excitations…
Design, Dynamics, and Dissipation of a Torsional-Magnetic Spring Mechanism
Ali Kanj, Rhinithaa P. Thanalakshme, Chengzhang Li +3
We present an analytical and experimental study of torsional magnetic mechanism where the restoring torque is due to magnetic field interactions between rotating and fixed permanen…
Bound states at partial dislocation defects in multipole higher-order topological insulators
Sasha S. Yamada, Tianhe Li, Mao Lin +3
The bulk-boundary correspondence, which links a bulk topological property of a material to the existence of robust boundary states, is a hallmark of topological insulators. However…
Electrically driven linear optical isolation through phonon mediated Autler-Townes splitting
Donggyu Sohn, Oğulcan E. Örsel, Gaurav Bahl
Optical isolators are indispensible components in nearly all photonic systems as they help ensure unidirectionality and provide crucial protection from undesirable reflections. Whi…
Magneto-Mechanical Transmitters for Ultra-Low Frequency Near-field Communication
Rhinithaa P. Thanalakshme, Ali Kanj, JunHwan Kim +6
Electromagnetic signals in the ultra-low frequency (ULF) range below 3 kHz are well suited for underwater and underground wireless communication thanks to low signal attenuation an…
On-chip optical non-reciprocity through a synthetic Hall effect for photons
Soonwook Kim, Donggyu B. Sohn, Christopher W. Peterson +1
We demonstrate a synthetic Hall effect for light, using an acousto-optically modulated nanophotonic resonator chain. To produce this effect, we simultaneously generate the required…
Observation of trapped fractional charge and topological states at disclination defects in higher-order topological insulators
Christopher W. Peterson, Tianhe Li, Wentao Jiang +2
Topological crystalline insulators (TCIs) can exhibit unique, quantized electric phenomena such as fractional electric polarization and boundary-localized fractional charge. This q…
A fractional corner anomaly reveals higher-order topology
Christopher W. Peterson, Tianhe Li, Wladimir A. Benalcazar +2
Spectral measurements of boundary localized in-gap modes are commonly used to identify topological insulators via the bulk-boundary correspondence. This can be extended to high-ord…
Trapped state at a dislocation in a weak magnetomechanical topological insulator
Inbar Hotzen Grinberg, Mao Lin, Wladimir A. Benalcazar +2
Topological insulators (TIs) are characterized by an insulating bulk and symmetry protected bound state on their boundaries. A "strong" topological insulator is characterized by ro…
Direction reconfigurable non-reciprocal acousto-optic modulator on chip
Donggyu B Sohn, Gaurav Bahl
Non-reciprocal components are essential in photonic systems for protecting light sources and for signal routing functions. Acousto-optic methods to produce non-reciprocal devices o…
Robust temporal pumping in a magneto-mechanical topological insulator
Inbar Hotzen Grinberg, Mao Lin, Cameron Harris +4
The transport of energy through 1-dimensional (1D) waveguiding channels can be affected by sub-wavelength disorder, resulting in undesirable localization and backscattering phenome…
Strong nonreciprocity in modulated resonator chains through synthetic electric and magnetic fields
Christopher W. Peterson, Wladimir A. Benalcazar, Mao Lin +2
We study nonreciprocity in spatiotemporally modulated 1D resonator chains from the perspective of equivalent 2D resonator arrays with a synthetic dimension and transverse synthetic…
Dynamic suppression of Rayleigh light scattering in dielectric resonators
Seunghwi Kim, Jacob M. Taylor, Gaurav Bahl
The ultimate limits of performance for any classical optical system are set by sub-wavelength fluctuations within the host material, that may be frozen-in or even dynamically induc…
Optomechanical non-contact measurement of microparticle compressibility in liquids
Kewen Han, Jeewon Suh, Gaurav Bahl
High-throughput label-free measurements of the optical and mechanical properties of single microparticles play an important role in biological research, drug development, and relat…
Imaging of acoustic pressure modes in opto-mechano-fluidic resonators with a single particle probe
Jeewon Suh, Kewen Han, Gaurav Bahl
Opto-mechano-fluidic resonators (OMFRs) are a new platform for high-throughput sensing of the mechanical properties of freely flowing microparticles in arbitrary media. Experimenta…
Demonstration of a quantized microwave quadrupole insulator with topologically protected corner states
Christopher W. Peterson, Wladimir A. Benalcazar, Taylor L. Hughes +1
The modern theory of electric polarization in crystals associates the dipole moment of an insulator with a Berry phase of its electronic ground state [1, 2]. This concept constitut…
Breaking time-reversal symmetry with acoustic pumping of nanophotonic circuits
Donggyu B Sohn, Seunghwi Kim, Gaurav Bahl
Achieving non-reciprocal light propagation via stimuli that break time-reversal symmetry, without magneto-optics, remains a major challenge for integrated nanophotonic devices. Rec…
Optimization of Anisotropic Photonic Density of States for Raman Cooling
Yin-Chung Chen, Indronil Ghosh, André Schleife +2
Optical refrigeration of solids holds tremendous promise for applications in thermal management. It can be achieved through multiple mechanisms including inelastic anti-Stokes Bril…