Diffusive to quasi-ballistic random laser: incoherent and coherent models

Guerin, William; Chong, Yidong; Baudouin, Quentin; Liertzer, Matthias; Rotter, Stefan; Kaiser, Robin

doi:10.1364/josab.33.001888

Cited by 4 publications

(3 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the cluster diameter divided by sc , is smaller than 6. This justifies our modeling of the random laser in the intermediate regime between the diffusive and ballistic limits (37).…”

Section: Supplementary Materials Materials and Methodssupporting

confidence: 78%

“…Random lasing model. The random lasing model is based on the radiative transfer equation (RTE) (37) and estimates the critical radius R cr , which is the minimum size of a colloidal cluster needed to achieve the lasing threshold. Since the lateral dimensions of our sample are much larger than its thickness, we used a two-dimensional model where R cr is given by solving…”

Section: Supplementary Materials Materials and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Self-organized lasers of reconfigurable colloidal assemblies

Trivedi,

Saxena,

et al. 2022

Preprint

View full text Add to dashboard Cite

Biological cells self-organize into living materials that uniquely blend structure with functionality and responsiveness to the environment. The integration of similar life-like features in man-made materials remains challenging, yet desirable to manufacture active, adaptive and autonomous systems. Here we show the self-organization of programmable random lasers from the reversible outof-equilibrium self-assembly of colloids. Random lasing originates from the optical amplification of light undergoing multiple scattering within the dissipative colloidal assemblies and therefore is crucially dependent on their selforganization behavior. Under external light stimuli, these dynamic random lasers are responsive and present a continuously tunable laser threshold. They can thus reconfigure and cooperate by emulating the ever-evolving spatiotemporal relationship between structure and functionality typical of living matter.

show abstract

“…the cluster diameter divided by sc , is smaller than 6. This justifies our modeling of the random laser in the intermediate regime between the diffusive and ballistic limits (37).…”

Section: Supplementary Materials Materials and Methodssupporting

confidence: 78%

Section: Supplementary Materials Materials and Methodsmentioning

confidence: 99%

Self-organized lasers of reconfigurable colloidal assemblies

Trivedi,

Saxena,

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In the diffusive regime, photon is diffusive due to multiple scattering of photons, and the scattering process can be approximated as isotropic. Between the ballistic and diffusive regimes, photon undergoes a few scattering events in the highly forward direction and travels along the zig-zag paths while changing the direction [6,7]. In this paper, we call this few-scattering-event regime between the ballistic and diffusive regimes as the scattering regime, so that we consider the three kinds of characteristic regimes for photon transport.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Length and Time Scales of the Highly Forward Scattering of Photons in Random Media

et al. 2019

View full text Add to dashboard Cite

Background: Elucidation of the highly forward scattering of photons in random media such as biological tissue is crucial for further developments of optical imaging using photon transport models. We evaluated length and time scales of the photon scattering in three-dimensional media. Methods: We employed analytical solutions of the time-dependent radiative transfer, M-th order delta-Eddington, and photon diffusion equations (RTE, dEM, and PDE). We calculated the fluence rates at different source-detector distances and optical properties. Results: We found that the zeroth order dEM and PDE, which approximate the highly forward scattering to the isotropic scattering, are valid in longer length and time scales than approximately 10 / μ t ′ and 40 / μ t ′ v , respectively, where μ t ′ is the reduced transport coefficient and v the speed of light in a medium. The first and second order dEM, which approximate the highly forward-peaked phase function by the first two and three Legendre moments, are valid in the longer scales than approximately 4.0 / μ t ′ and 6.3 / μ t ′ v ; 2.8 / μ t ′ and 3.5 / μ t ′ v , respectively. The boundary conditions less influence the length scales, while they reduce the times scales from those for bulk at the longer length scale than approximately 4.0 / μ t ′ . Conclusion: Our findings are useful for constructions of accurate and efficient photon transport models. We evaluated length and time scales of the highly forward scattering of photons in various kinds of three-dimensional random media by analytical solutions of the radiative transfer, M-th order delta-Eddington, and photon diffusion equations.

show abstract

Self-organized lasers from reconfigurable colloidal assemblies

Trivedi

Saxena

et al. 2022

Nat. Phys.

View full text Add to dashboard Cite

Diffusive to quasi-ballistic random laser: incoherent and coherent models

Cited by 4 publications

References 51 publications

Self-organized lasers of reconfigurable colloidal assemblies

Self-organized lasers of reconfigurable colloidal assemblies

Characteristic Length and Time Scales of the Highly Forward Scattering of Photons in Random Media

Self-organized lasers from reconfigurable colloidal assemblies

Contact Info

Product

Resources

About