Steven T. Cundiff
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View article: Probing complex decoherence processes in materials for quantum applications
Probing complex decoherence processes in materials for quantum applications Open
The primary consideration in developing new material platforms for quantum applications is to optimize coherence. Despite its importance, decoherence processes remain challenging to experimentally interrogate and quantify. In this Perspect…
View article: Sensitivity Improvement in Dual Comb Spectroscopy With Time-Programmed Electro-Optic Frequency Combs
Sensitivity Improvement in Dual Comb Spectroscopy With Time-Programmed Electro-Optic Frequency Combs Open
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View article: Polariton spectra under the collective coupling regime. II. 2D non-linear spectra
Polariton spectra under the collective coupling regime. II. 2D non-linear spectra Open
In our previous work [Mondal et al., J. Chem. Phys. 162, 014114 (2025)], we developed several efficient computational approaches to simulate exciton–polariton dynamics described by the Holstein–Tavis–Cummings (HTC) Hamiltonian under the co…
View article: Polariton spectra under the collective coupling regime. I. Efficient simulation of linear spectra and quantum dynamics
Polariton spectra under the collective coupling regime. I. Efficient simulation of linear spectra and quantum dynamics Open
We outline two general theoretical techniques to simulate polariton quantum dynamics and optical spectra under the collective coupling regimes described by a Holstein–Tavis–Cummings (HTC) model Hamiltonian. The first one takes advantage of…
View article: Mechanism of Molecular Polariton Decoherence in the Collective Light–Matter Couplings Regime
Mechanism of Molecular Polariton Decoherence in the Collective Light–Matter Couplings Regime Open
Molecular polaritons, the hybridization of electronic states in molecules with photonic excitation inside a cavity, play an important role in fundamental quantum science and technology. Understanding the decoherence mechanism of molecular …
View article: Polariton Spectra under the Collective Coupling Regime. II. 2D Non-linear Spectra
Polariton Spectra under the Collective Coupling Regime. II. 2D Non-linear Spectra Open
In our previous work [Ref.~\citenum{MondalJCP2024paper1}], we developed several efficient strategies to simulate exciton-polariton dynamics described by the Holestein-Tavis-Cummings (HTC) Hamiltonian under the collective coupling regime. H…
View article: Polariton Spectra under the Collective Coupling Regime. I. Efficient Simulation of Linear Spectra and Quantum Dynamics
Polariton Spectra under the Collective Coupling Regime. I. Efficient Simulation of Linear Spectra and Quantum Dynamics Open
We outline two general theoretical techniques to simulate polariton quantum dynamics and optical spectra under the collective coupling regimes described by a Holestein-Tavis-Cummings (HTC) model Hamiltonian. The first one takes the advanta…
View article: Imaging exciton interactions in two-dimensional materials and heterostructures with spectroscopic microscopy
Imaging exciton interactions in two-dimensional materials and heterostructures with spectroscopic microscopy Open
Exciton interactions are at the heart of carrier dynamics and applications of two-dimensional materials derived from their strong light-matter interactions. Exciton-phonon interactions affect the dephasing time of excitons in few-layer tra…
View article: Time-multiplexed electro-optic modulation for enhanced signal to noise ratio and recording speed in dual frequency comb spectroscopy
Time-multiplexed electro-optic modulation for enhanced signal to noise ratio and recording speed in dual frequency comb spectroscopy Open
We demonstrate a novel technique to improve the signal-to-noise ratio (SNR) and/or alternatively the recording speed of dual comb spectroscopy (DCS) through time multiplexing of the interferograms. The all-fiber architecture utilizes elect…
View article: Time-multiplexed electro-optic modulation for enhanced signal to noise ratio and recording speed in dual frequency comb spectroscopy
Time-multiplexed electro-optic modulation for enhanced signal to noise ratio and recording speed in dual frequency comb spectroscopy Open
We demonstrate a novel technique to improve the signal-to-noise ratio (SNR) and/or alternatively the recording speed of dual comb spectroscopy (DCS) through time multiplexing of the interferograms. The all-fiber architecture utilizes elect…
View article: Mechanism of Polariton Decoherence in the Collective Light-Matter Couplings Regime
Mechanism of Polariton Decoherence in the Collective Light-Matter Couplings Regime Open
Molecular polaritons, the hybridization of electronic states in molecules with photonic excitation inside a cavity, play an important role in fundamental quantum science and technology. Understanding the de-coherence mechanism of molecular…
View article: Quantum dynamics simulations of the 2D spectroscopy for exciton polaritons
Quantum dynamics simulations of the 2D spectroscopy for exciton polaritons Open
We develop an accurate and numerically efficient non-adiabatic path-integral approach to simulate the non-linear spectroscopy of exciton–polariton systems. This approach is based on the partial linearized density matrix approach to model t…
View article: Quantum Dynamics Simulations of the 2D Spectroscopy for Exciton Polaritons
Quantum Dynamics Simulations of the 2D Spectroscopy for Exciton Polaritons Open
We develop an accurate and numerically efficient non-adiabatic path-integral approach to simulate the non- linear spectroscopy of exciton-polariton systems. This approach is based on the partial linearized density matrix (PLDM) approach to…
View article: Measuring exciton-phonon coupling in semiconductor nanocrystals
Measuring exciton-phonon coupling in semiconductor nanocrystals Open
At low excitation density, the dynamics of excitons in semiconductor nanocrystals are largely dictated by their interactions with the underlying atomic lattice. This exciton-phonon coupling (EPC) is responsible, for example, for absorption…
View article: Soliton glasses in Fabry-Perot resonators
Soliton glasses in Fabry-Perot resonators Open
We study novel soliton glass frequency combs to a modified Lugiato-Lefever Equation (LLE) that include cross-phase modulation within a Fabry-Perot resonator. Soliton glasses are characterized by stable, spatially locked, phase-locked, and …
View article: Rapid multiplex ultrafast nonlinear microscopy for material characterization
Rapid multiplex ultrafast nonlinear microscopy for material characterization Open
We demonstrate rapid imaging based on four-wave mixing (FWM) by assessing the quality of advanced materials through measurement of their nonlinear response, exciton dephasing, and exciton lifetimes. We use a WSe 2 monolayer grown by chemic…
View article: Rapid multiplex ultrafast nonlinear microscopy for material characterization
Rapid multiplex ultrafast nonlinear microscopy for material characterization Open
We demonstrate rapid imaging based on four-wave mixing (FWM) by assessing the quality of advanced materials through measurement of their nonlinear response, exciton dephasing, and exciton lifetimes. We use a WSe$_2$ monolayer grown by chem…
View article: Coherent Interactions between Silicon-Vacancy Centers in Diamond
Coherent Interactions between Silicon-Vacancy Centers in Diamond Open
We report tunable excitation-induced dipole-dipole interactions between silicon-vacancy color centers in diamond at cryogenic temperatures. These interactions couple centers into collective states, and excitation-induced shifts tag the exc…
View article: Imaging dynamic exciton interactions and coupling in transition metal dichalcogenides
Imaging dynamic exciton interactions and coupling in transition metal dichalcogenides Open
Transition metal dichalcogenides (TMDs) are regarded as a possible material platform for quantum information science and related device applications. In TMD monolayers, the dephasing time and inhomogeneity are crucial parameters for any qu…
View article: Perspective: multi-dimensional coherent spectroscopy of perovskite nanocrystals
Perspective: multi-dimensional coherent spectroscopy of perovskite nanocrystals Open
Recently, colloidal perovskite nanocrystals (PNCs) have emerged as an exciting material platform for optoelectronic applications due to their combination of facile synthesis routes, quantum size effects, and exceptional optical properties …
View article: Coherent exciton-exciton interactions and exciton dynamics in a MoSe\textsubscript{2}/WSe\textsubscript{2} heterostructure
Coherent exciton-exciton interactions and exciton dynamics in a MoSe\textsubscript{2}/WSe\textsubscript{2} heterostructure Open
Coherent coupling between excitons is at the heart of many-body interactions with transition metal dichalcogenide (TMD) heterostructures as an emergent platform for the investigation of these interactions. We employ multi-dimensional coher…
View article: Concurrent Passive Mode-Locked and Self-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Q</mml:mi></mml:mrow></mml:math>-Switched Operation in Laser Systems
Concurrent Passive Mode-Locked and Self--Switched Operation in Laser Systems Open
Concurrent passive mode-locked and self-Q-switched operation of laser devices is modeled using the complex cubic-quintic Ginzburg-Landau equation. Experimental observations use a passively mode-locked fiber ring laser with a waveguide arra…
View article: Hidden Silicon-Vacancy Centers in Diamond
Hidden Silicon-Vacancy Centers in Diamond Open
We characterize a high-density sample of negatively charged silicon-vacancy (SiV^{-}) centers in diamond using collinear optical multidimensional coherent spectroscopy. By comparing the results of complementary signal detection schemes, we…
View article: Coherent Interactions Between Silicon-Vacancy Centers in Diamond
Coherent Interactions Between Silicon-Vacancy Centers in Diamond Open
We report coherent interactions within an ensemble of silicon-vacancy color centers in diamond. The interactions are ascribed to resonant dipole-dipole coupling. Further, we demonstrate control over resonant center pairs by using a driving…
View article: Spectral broadening and ultrafast dynamics of a nitrogen-vacancy center ensemble in diamond
Spectral broadening and ultrafast dynamics of a nitrogen-vacancy center ensemble in diamond Open
Many applications of nitrogen-vacancy (NV) centers in diamond crucially rely on a spectrally narrow and stable optical zero-phonon line transition. Though many impressive proof-of-principle experiments have been demonstrated, much work rem…
View article: Toward Engineering Intrinsic Line Widths and Line Broadening in Perovskite Nanoplatelets
Toward Engineering Intrinsic Line Widths and Line Broadening in Perovskite Nanoplatelets Open
Perovskite nanoplatelets possess extremely narrow absorption and emission line widths, which are crucial characteristics for many optical applications. However, their underlying intrinsic and extrinsic line-broadening mechanisms are poorly…
View article: Analysis of light coupling in Al<sub>x</sub>Ga<sub>1-x</sub>As waveguide arrays
Analysis of light coupling in Al<sub>x</sub>Ga<sub>1-x</sub>As waveguide arrays Open
Light propagation in arrays of Al x Ga 1-x As waveguides is studied. The power coupling constant between two adjacent waveguides is precisely measured as waveguide material and structure is varied. Aluminum concentration contrast between w…
View article: Multidimensional coherent spectroscopy reveals triplet state coherences in cesium lead-halide perovskite nanocrystals
Multidimensional coherent spectroscopy reveals triplet state coherences in cesium lead-halide perovskite nanocrystals Open
Multidimensional spectroscopy suggests that perovskite nanocrystals have a dark state interleaved with the triplet states.
View article: Line-shape analysis of double-quantum multidimensional coherent spectra
Line-shape analysis of double-quantum multidimensional coherent spectra Open
Double-quantum two-dimensional coherent spectroscopy (MDCS) is a powerful optical method that is used to study optical properties of atomic and complex molecular systems and semiconductor materials. Double-quantum 2D spectra and particular…
View article: Fast phase cycling in non-collinear optical two-dimensional coherent spectroscopy
Fast phase cycling in non-collinear optical two-dimensional coherent spectroscopy Open
As optical two-dimensional coherent spectroscopy (2DCS) is extended to a broader range of applications, it is critical to improve the detection sensitivity of optical 2DCS. We developed a fast phase-cycling scheme in a non-collinear optica…