Temporal behaviour of open-circuit photovoltaic solitons

【摘要】 Based on the time-dependent band-transport model in a photorefractive medium,dark open-circuit photovoltaic(PV) solitons are investigated both theoretically and experimentally.Compared with those of the time-independent models,our theoretical results revealed that quasi-steady-state and steady-state PV solitons can both be obtained.Our results also revealed that when r < 1(r is the normalized intensity at infinity),the full width at half maximum(FWHM) of solitons decreases monotonically to a constant value;when r > 1,however,the FWHM of solitons first decreases to a minimum before it increases to a constant value.Moreover,the FWHM of steady solitons decreases with increasing intensity ratio for r < 1,and increases with increasing intensity ratio for r > 1.We further observed dark PV solitons in experiments,and recorded their evolution.These results indicated that steady solitons can be observed at low optical power,while quasi-steady-state solitons can only be generated at higher optical power.Good agreement is found between theory and experiment.更多还原

【Abstract】 Based on the time-dependent band-transport model in a photorefractive medium,dark open-circuit photovoltaic(PV) solitons are investigated both theoretically and experimentally.Compared with those of the time-independent models,our theoretical results revealed that quasi-steady-state and steady-state PV solitons can both be obtained.Our results also revealed that when r < 1(r is the normalized intensity at infinity),the full width at half maximum(FWHM) of solitons decreases monotonically to a constant value;when r > 1,however,the FWHM of solitons first decreases to a minimum before it increases to a constant value.Moreover,the FWHM of steady solitons decreases with increasing intensity ratio for r < 1,and increases with increasing intensity ratio for r > 1.We further observed dark PV solitons in experiments,and recorded their evolution.These results indicated that steady solitons can be observed at low optical power,while quasi-steady-state solitons can only be generated at higher optical power.Good agreement is found between theory and experiment.更多还原