We experimentally demonstrate and numerically analyze large arrays of whispering gallery resonators.Using fluorescent mapping,we measure the spatial distribution of the cavity ensemble’s resonances,revealing that lig...We experimentally demonstrate and numerically analyze large arrays of whispering gallery resonators.Using fluorescent mapping,we measure the spatial distribution of the cavity ensemble’s resonances,revealing that light reaches distant resonators in various ways,including while passing through dark gaps,resonator groups,or resonator lines.Energy spatially decays exponentially in the cavities.Our practically infinite periodic array of resonators,with a quality factor(Q)exceeding 107,might impact a new type of photonic ensembles for nonlinear optics and lasers using our cavity continuum that is distributed,while having high-Q resonators as unit cells.展开更多
Currently,optical or mechanical resonances are commonly used in microfluidic research.However,optomechanical oscillations by light pressure were not shown with liquids.This is because replacing the surrounding air wit...Currently,optical or mechanical resonances are commonly used in microfluidic research.However,optomechanical oscillations by light pressure were not shown with liquids.This is because replacing the surrounding air with water inherently increases the acoustical impedance and hence,the associated acoustical radiation losses.Here,we bridge between microfluidics and optomechanics by fabricating a hollow-bubble resonator with liquid inside and optically exciting vibrations with 100 MHz rates using only mW optical-input power.This constitutes the first time that any microfluidic system is optomechanically actuated.We further prove the feasibility of microfluidic optomechanics on liquids by demonstrating vibrations on organic fluids with viscous dissipation higher than blood viscosity while measuring density changes in the liquid via the vibration frequency shift.Our device will enable using cavity optomechanics for studying non-solid phases of matter,while light is easily coupled from the outer dry side of the capillary and fluid is provided using a standard syringe pump.展开更多
We fabricate a tapered fiber coupler, position it near an ultrahigh-Q resonator made from a microdroplet, and experimentally measure stimulated Raman emission. We then calculate the molecular vibrational mode associat...We fabricate a tapered fiber coupler, position it near an ultrahigh-Q resonator made from a microdroplet, and experimentally measure stimulated Raman emission. We then calculate the molecular vibrational mode associated with each of the Raman lines and present it in a movie. Our Raman laser lines show themselves at a threshold of 160 μW input power, the cold-cavity quality factor is 250 million, and mode volume is 23 μm^3. Both pump and Raman laser modes overlap with the liquid phase instead of just residually extending to the fluid.展开更多
文摘We experimentally demonstrate and numerically analyze large arrays of whispering gallery resonators.Using fluorescent mapping,we measure the spatial distribution of the cavity ensemble’s resonances,revealing that light reaches distant resonators in various ways,including while passing through dark gaps,resonator groups,or resonator lines.Energy spatially decays exponentially in the cavities.Our practically infinite periodic array of resonators,with a quality factor(Q)exceeding 107,might impact a new type of photonic ensembles for nonlinear optics and lasers using our cavity continuum that is distributed,while having high-Q resonators as unit cells.
基金This research was supported by the Defense Advanced Research Projects Agency Optical Radiation Cooling and Heating in Integrated Devices programme and by the Air Force Office of Scientific Research.
文摘Currently,optical or mechanical resonances are commonly used in microfluidic research.However,optomechanical oscillations by light pressure were not shown with liquids.This is because replacing the surrounding air with water inherently increases the acoustical impedance and hence,the associated acoustical radiation losses.Here,we bridge between microfluidics and optomechanics by fabricating a hollow-bubble resonator with liquid inside and optically exciting vibrations with 100 MHz rates using only mW optical-input power.This constitutes the first time that any microfluidic system is optomechanically actuated.We further prove the feasibility of microfluidic optomechanics on liquids by demonstrating vibrations on organic fluids with viscous dissipation higher than blood viscosity while measuring density changes in the liquid via the vibration frequency shift.Our device will enable using cavity optomechanics for studying non-solid phases of matter,while light is easily coupled from the outer dry side of the capillary and fluid is provided using a standard syringe pump.
基金the Israeli Center for Research Excellence“Circle of Light”grant No.1802/12,the Israel Science Foundation(2013/15),the Israel Ministry of Science,Technology and Space.We thank Dr.Rachel Edrie for her help with the Raman spectrum measurement.
文摘We fabricate a tapered fiber coupler, position it near an ultrahigh-Q resonator made from a microdroplet, and experimentally measure stimulated Raman emission. We then calculate the molecular vibrational mode associated with each of the Raman lines and present it in a movie. Our Raman laser lines show themselves at a threshold of 160 μW input power, the cold-cavity quality factor is 250 million, and mode volume is 23 μm^3. Both pump and Raman laser modes overlap with the liquid phase instead of just residually extending to the fluid.
