Effect of concentration on the formation time of diffraction rings in spatial self-phase modulation

Abstract

A new unsaturated wind-chime model is proposed for calculating the formation time of the diffraction rings induced by spatial self-phase modulation (SSPM) in molybdenum disulfide suspension. To optimize the traditional wind-chime model, the concentration variable of 2D materials was introduced. The results of the unsaturated wind-chime model match quite well with the SSPM experimental results of molybdenum disulfide. Based on this model, the shortest formation time of diffraction rings and their corresponding concentration and light intensity can be predicted using limited data. Theoretically, by increasing the viscosity coefficient of the solution, the response time of the diffraction ring, to reach the maximum value, can be significantly reduced. It has advanced significance in shortening the response time of photonic diodes.

Degenerate and non-degenerate all-optical switches using violet phosphorus nanosheets

“…The obtained τ F value is inversely proportional to the light intensity I , which is consistent with the observations reported previously. 16,21,28 The measured τ F value of VP Ns is slightly shorter than the τ F of ∼0.7 s of BP Ns. 9…”

“…The obtained τ F value is inversely proportional to the light intensity I, which is consistent with the observations reported previously. 16,21,28 The measured τ F value of VP Ns is slightly shorter than the τ F of ∼0.7 s of BP Ns. 9 It is known to all that the nonlinear refractive index n 2 of the material can be directly inferred from the intensity dependence of the ring number in the complete ring pattern.…”

“…This concentration-dependent SSPM behavior has recently been confirmed theoretically and experimentally. 28 In addition, after three dispersions were kept for 48 hours, it was found that VP Ns were most stable in NMP, while precipitation occurred in DMF and C 2 H 6 O. In short, it is optimal to use NMP as the reaction solvent for preparing VP Ns.…”

Nonlinear Coherent Light–Matter Interaction in 2D MoSe2 Nanoflakes for All‐Optical Switching and Logic Applications

“…[16,17] Based on the energy relaxation process, the samples are reoriented from an arbitrary angle to the direction of the electric field of the incident light beam. [18] Although the above model describes the SSPM phenomena quite well, there are still a few open questions, like how the relaxation process occurs with incident light energy, how the relaxation time depends upon the solvent viscosity, and the role of polar and non-polar solvents? Therefore a detailed study of SSPM with different materials and solvents is desired for in-depth understanding.…”

Demonstration of Spatial Asymmetric Light Propagation Performance Using Violet Phosphorus Quantum Dots with Tunable Bandgap

“…In addition to characterizing the nonlinear refractive index of nanomaterials, [ 11,14 ] SSPM has also been developed for passive nonlinear photonic devices (e.g., all‐optical switches, [ 17 ] logic gates, [ 18 ] diodes, [ 19 ] isolators, [ 16 ] and information converters [ 20 ] ). It is noteworthy that many factors affect the far‐field self‐diffraction ring pattern, including the relative position of the sample to the focus of the focused beam, [ 21 ] the light intensity, [ 14 ] the wavelength, [ 17 ] the beam profile, [ 22 ] the solvent, [ 3 ] sample concentrations, [ 23 ] sample defects, [ 24 ] and absorption properties of materials. [ 25 ] To better study the SSPM phenomena of novel nanomaterials and develop their applications, it is very necessary to comprehensively understand the factors that contribute to the formation of self‐diffraction ring patterns.…”