2013/08/14 by Weining Man, Shima Fardad, Ze Zhang +7 · 93 citations
Chemistry · Physics and Astronomy · #Chemical physics #Chemistry #Colloid #Light scattering #Materials science #Mixing (physics) #Molecular physics #Molecule #Nonlinear system #Optics #Orbital Angular Momentum in Optics #Particle (ecology) #Physics #Polarizability #Quantum mechanics #Random lasers and scattering media #Scattering #Soft matter #Spectroscopy and Quantum Chemical Studies #Thermal #Thermodynamics #cond-mat.soft #physics.optics
paper · pdf · doi:10.1103/physrevlett.111.218302
published in Physical Review Letters 111(21), 218302 (American Physical Society)
arxiv created 2013/08/14 · openalex publication_date 2013/11/21 · arxiv updated 2014/10/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We demonstrate a new class of synthetic colloidal suspensions capable of exhibiting negative polarizabilities, and observe for the first time robust propagation and enhanced transmission of self-trapped light over long distances that would have been otherwise impossible in conventional suspensions with positive polarizabilities. Such light penetration through the strong scattering environment is attributed to the interplay between optical forces and self-activated transparency effects while no thermal effect is involved. By judiciously mixing colloidal particles of both negative and positive polarizabilities, we show that the resulting nonlinear response of these systems can be fine-tuned. Our experimental observations are in agreement with theoretical analysis based on a thermodynamic model that takes into account particle-particle interactions. These results may open up new opportunities in developing soft-matter systems with engineered optical nonlinearities.