Dynamical calculation of third-harmonic generation in a semiconductor quantum well

Guazzotti, Stefano; Pusch, Andreas; Reiter, Doris E.; Hess, Ortwin

doi:10.1103/physrevb.94.115303

Cited by 9 publications

(11 citation statements)

References 46 publications

(57 reference statements)

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“…The time evolution of the polarization is obtained via a band-resolved density matrix approach to the electron dynamics in the semiconductor quantum well [29,30,40], which accounts for occupations as well as coherences between valence and conduction states. Due to the small momentum carried by the electromagnetic fields, only coherences between states with the same momentum k need to be considered.…”

Section: Time Domain Simulations Of Lasing Dynamicsmentioning

confidence: 99%

Suppressing spatiotemporal lasing instabilities with wave-chaotic microcavities

Bittner

Guazzotti

Zeng

et al. 2018

Science

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Spatiotemporal instabilities are widespread phenomena resulting from complexity and nonlinearity. In broad-area edge-emitting semiconductor lasers, the nonlinear interactions of multiple spatial modes with the active medium can result in filamentation and spatiotemporal chaos. These instabilities degrade the laser performance and are extremely challenging to control. We demonstrate a powerful approach to suppress spatiotemporal instabilities using wave-chaotic or disordered cavities. The interference of many propagating waves with random phases in such cavities disrupts the formation of self-organized structures such as filaments, resulting in stable lasing dynamics. Our method provides a general and robust scheme to prevent the formation and growth of nonlinear instabilities for a large variety of high-power lasers.

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Section: Time Domain Simulations Of Lasing Dynamicsmentioning

confidence: 99%

Suppressing spatiotemporal lasing instabilities with wave-chaotic microcavities

Bittner

Guazzotti

Zeng

et al. 2018

Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Eq. (4)) 36 . In the following, we shall focus on interactions within the same band which dominate for small densities and truncate the infinite hierarchy of equations on the mean field level.…”

Section: Excitonsmentioning

confidence: 99%

“…The light pulse then propagates through the structure and interacts with the TMDC monolayer. We record the reflected and transmitted fields through the intensities I ref l and I trans , respectively 36 . The spectrum α is then calculated via…”

Section: Excitonsmentioning

confidence: 99%

“…The nonlinear optical response of semiconductor nanostructures calls for a microscopic treatment of the carrier dynamics, while the simulation of the light field in photonic structures requires an adequate description that accounts for the different materials on the nanoscale. Here, we present a practical method combining a microscopic description of the TMDC semiconductor using the many-body semiconductor Bloch equations with a self-consistent spatiotemporal full time-domain simulation of the optical fields beyond the slowly-varying amplitude or paraxial approximations on the basis of a finite difference time domain (FDTD) method [34][35][36][37] to calculate linear and non-linear optical signals of a TMDC monolayer embedded in a nanophotonic structure.…”

Section: Introductionmentioning

confidence: 99%

“…We consider different material substrates with different refractive indices and discuss the resulting absorption spectra. Our method is capable of calculating non-linear optical signals, e.g., third harmonic generation 36 . By introducing a permanent dipole, we extend the Bloch equations to also being able to describe the generation of even harmonics.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic theory of nanophotonic control of two-dimensional semiconductor nonlinearities

et al. 2018

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We introduce a Maxwell-Bloch simulation approach which self-consistently combines a microscopic description of the carrier and polarisation dynamics of a transition-metal-dichalcogenide (TMDC) monolayer with a spatio-temporal full-wave time-domain simulation of Maxwell's equations on the basis of a finite-difference time-domain (FDTD) method beyond the slowly-varying amplitude or paraxial approximations. This offers a platform to realistically model, in particular, the typical ultrafast optical excitation experiments in micro-and nanocavities. Our simulations confirm that the weak screening of the Coulomb interaction in TMDC monolayers yields pronounced exciton lines in the linear spectrum and we uncover the second order nonlinearity represented in the semiconductor Maxwell-Bloch equations by an intraband dipole moment. This allows us to calculate the spectral shape of the exceptionally strong second harmonic generation around the exciton lines of TMDC monolayers. We demonstrate that the second harmonic signal can remarkably be further enhanced by several orders of magnitude through a suitably designed (one-dimensional) photonic microcavity. Due to its self-consistency, flexibility, explicit spatio-temporal resolution on the nanoscale and the ready access to light field and electron dynamics, our theory and computational approach is an ideal platform to design and explore spatio-temporal nonlinear and quantum dynamics in complex photonic or plasmonic micro-and nano-structures for opto-electronic, nanophotonic and quantum applications of TMDC monolayers.

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Optics of exciton-plasmon nanomaterials

Sukharev

Nitzan

2017

J. Phys.: Condens. Matter

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This review provides a brief introduction to the physics of coupled exciton-plasmon systems, the theoretical description and experimental manifestation of such phenomena, followed by an account of the state-of-the-art methodology for the numerical simulations of such phenomena and supplemented by a number of FORTRAN codes, by which the interested reader can introduce himself/herself to the practice of such simulations. Applications to CW light scattering as well as transient response and relaxation are described. Particular attention is given to so-called strong coupling limit, where the hybrid exciton-plasmon nature of the system response is strongly expressed. While traditional descriptions of such phenomena usually rely on analysis of the electromagnetic response of inhomogeneous dielectric environments that individually support plasmon and exciton excitations, here we explore also the consequences of a more detailed description of the molecular environment in terms of its quantum density matrix (applied in a mean field approximation level). Such a description makes it possible to account for characteristics that cannot be described by the dielectric response model: the effects of dephasing on the molecular response on one hand, and nonlinear response on the other. It also highlights the still missing important ingredients in the numerical approach, in particular its limitation to a classical description of the radiation field and its reliance on a mean field description of the many-body molecular system. We end our review with an outlook to the near future, where these limitations will be addressed and new novel applications of the numerical approach will be pursued.

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Dynamical calculation of third-harmonic generation in a semiconductor quantum well

Cited by 9 publications

References 46 publications

Suppressing spatiotemporal lasing instabilities with wave-chaotic microcavities

Suppressing spatiotemporal lasing instabilities with wave-chaotic microcavities

Dynamic theory of nanophotonic control of two-dimensional semiconductor nonlinearities

Optics of exciton-plasmon nanomaterials

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