Shai Maayani - Academia.edu (original) (raw)
Papers by Shai Maayani
Path of a nanosphere in a a non-axially symmetric droplet
Path of a nanosphere in a resonator
The vibration modes of the polydimethylsiloxane molecule
Path of a nanosphere in a a non-axially symmetric droplet
Path of a nanosphere in a resonator
Physical Review Applied, 2018
Proceedings of SPIE, Apr 23, 2010
Micromachines, Mar 8, 2023
arXiv (Cornell University), Nov 15, 2017
Optical and Quantum Sensing and Precision Metrology II, 2022
Conference on Lasers and Electro-Optics, 2021
We investigate Implosion Fabrication, a technique which prints arbitrary 3D nanostructures, as a ... more We investigate Implosion Fabrication, a technique which prints arbitrary 3D nanostructures, as a new platform for nanophotonics. We show that optical properties of printed materials are tunable by characterizing the reflectivity of printed silver.
Largely-deformed1–4 microcavities5 support instabilities suppression6 chaotic ray-dynamics7, dire... more Largely-deformed1–4 microcavities5 support instabilities suppression6 chaotic ray-dynamics7, directional-emission8–10, and momentum transfer11 for nonlinear optics, but such deformations are generally possible only by fabricating discrete sets of resonators. In contrast, optical tweezers12–17 permit continuous large changes18–28, such as deformations from spherical dielectrics to triangular ones25. We report on transformable micro-photonic devices that change their functionality while operating. Assisted by computerized holographic-tweezers, we gradually deform the shape and change the functionality of a droplet whispering-gallery cavity. For example, we continuously deform hexagonal cavities to rectangular ones, and demonstrate switching to directionally emitting mode-of-operation, or splitting a resonant mode to a 10-GHz separated doublet. A continuous trend of improving spatial light modulators and tweezers suggests that our method is scalable to control the shape and functionali...
Fibers constitute the backbone of modern communication and are used in laser surgeries; fibers al... more Fibers constitute the backbone of modern communication and are used in laser surgeries; fibers also genarate coherent X-ray, guided-sound and supercontinuum. In contrast, fibers for capillary oscillations, which are unique to liquids, were rarely considered in optofluidics. Here we fabricate fibers by water bridging an optical tapered-coupler to a microlensed coupler. Our water fibers are held in air and their length can be longer than a millimeter. These hybrid fibers co-confine two important oscillations in nature: capillary- and electromagnetic-. We optically record vibrations in the water fiber, including an audio-rate fundamental and its 3 overtones in a harmonic series, that one can hear in soundtracks attached. Transforming Micro-Electro-Mechanical-Systems [MEMS] to Micro-Electro-Capillary-Systems [MECS], boosts the device softness by a million to accordingly improve its response to minute forces. Furthermore, MECS are compatible with water, which is a most important liquid i...
arXiv: Optics, 2016
We harness the momentum of light resonating inside a micro-droplet cavity, to experimentally gene... more We harness the momentum of light resonating inside a micro-droplet cavity, to experimentally generate micro-flows within the envelope of the drop. We 3D map these optically induced flows by using fluorescent nanoparticles; which reveals circular micro-streams. The flows are parametrically studied and, as expected, exhibit an increase of rotation speed with optical power. The flow is non-circular only when we intentionally break the axial symmetry of the droplet. Besides the fundamental interest in light-flow interactions including in opto-fluidic cavities, the optically controlled flows can serve in bringing analytes into the maximum-power region of the microcavity.
arXiv: Optics, 2015
Liquids serve microcavity research ever since Ashkins studies on optical resonances in levitating... more Liquids serve microcavity research ever since Ashkins studies on optical resonances in levitating droplets to recent optofluidic resonators. Droplets can provide optical quality factor (Q) in proximity to the limit restricted by water absorption and radiation loss. However, water micro-drops vaporize quickly due to their large area to volume ratio. Here we fabricate a water-air interface that almost entirely surrounds our device, allowing for more than 1,000,000 recirculations of light (finesse). We sustain the droplets for longer than 16 hours using a nano-water-bridge that extends from the droplet to a practically-unlimited distant-reservoir that compensates for evaporation. Our device exhibits surface tension 8000-times stronger than gravity that self-stabilizes its shape to a degree sufficient to maintain critical coupling as well as to resolve split modes. Our device has 98 percents of their surrounding walls made strictly of water-air interfaces with concave, convex or saddle ...
Energy exchange between light and sound was first suggested by Brillouin in 1922. After Townes es... more Energy exchange between light and sound was first suggested by Brillouin in 1922. After Townes established the phonon maser theory, coherent generation of intense hypersonic waves was observed together with stimulated Brillouin Scattering. Here we repeat these experiments, but with capillary-waves that are unique to the liquid phase of matter and relates to attraction between intimate fluid particles. We fabricate resonators that co-host capillary and opticalmodes, control it to operates at its non resolved sideband, and observe stimulated capillary scattering and coherent excitation of capillary resonances at kHz rates (that one can hear in audio files recorded by us). By exchanging energy between electromagnetic and capillary waves, we bridge interfacial tension phenomena at the liquid phase boundary to optics, and might impact optofluidics by allowing optical control, interrogation and cooling of water waves.
Photonics Research, 2019
We fabricate a tapered fiber coupler, position it near an ultrahigh-Q resonator made from a micro... more 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 μm3. Both pump and Raman laser modes overlap with the liquid phase instead of just residually extending to the fluid.
Path of a nanosphere in a a non-axially symmetric droplet
Path of a nanosphere in a resonator
The vibration modes of the polydimethylsiloxane molecule
Path of a nanosphere in a a non-axially symmetric droplet
Path of a nanosphere in a resonator
Physical Review Applied, 2018
Proceedings of SPIE, Apr 23, 2010
Micromachines, Mar 8, 2023
arXiv (Cornell University), Nov 15, 2017
Optical and Quantum Sensing and Precision Metrology II, 2022
Conference on Lasers and Electro-Optics, 2021
We investigate Implosion Fabrication, a technique which prints arbitrary 3D nanostructures, as a ... more We investigate Implosion Fabrication, a technique which prints arbitrary 3D nanostructures, as a new platform for nanophotonics. We show that optical properties of printed materials are tunable by characterizing the reflectivity of printed silver.
Largely-deformed1–4 microcavities5 support instabilities suppression6 chaotic ray-dynamics7, dire... more Largely-deformed1–4 microcavities5 support instabilities suppression6 chaotic ray-dynamics7, directional-emission8–10, and momentum transfer11 for nonlinear optics, but such deformations are generally possible only by fabricating discrete sets of resonators. In contrast, optical tweezers12–17 permit continuous large changes18–28, such as deformations from spherical dielectrics to triangular ones25. We report on transformable micro-photonic devices that change their functionality while operating. Assisted by computerized holographic-tweezers, we gradually deform the shape and change the functionality of a droplet whispering-gallery cavity. For example, we continuously deform hexagonal cavities to rectangular ones, and demonstrate switching to directionally emitting mode-of-operation, or splitting a resonant mode to a 10-GHz separated doublet. A continuous trend of improving spatial light modulators and tweezers suggests that our method is scalable to control the shape and functionali...
Fibers constitute the backbone of modern communication and are used in laser surgeries; fibers al... more Fibers constitute the backbone of modern communication and are used in laser surgeries; fibers also genarate coherent X-ray, guided-sound and supercontinuum. In contrast, fibers for capillary oscillations, which are unique to liquids, were rarely considered in optofluidics. Here we fabricate fibers by water bridging an optical tapered-coupler to a microlensed coupler. Our water fibers are held in air and their length can be longer than a millimeter. These hybrid fibers co-confine two important oscillations in nature: capillary- and electromagnetic-. We optically record vibrations in the water fiber, including an audio-rate fundamental and its 3 overtones in a harmonic series, that one can hear in soundtracks attached. Transforming Micro-Electro-Mechanical-Systems [MEMS] to Micro-Electro-Capillary-Systems [MECS], boosts the device softness by a million to accordingly improve its response to minute forces. Furthermore, MECS are compatible with water, which is a most important liquid i...
arXiv: Optics, 2016
We harness the momentum of light resonating inside a micro-droplet cavity, to experimentally gene... more We harness the momentum of light resonating inside a micro-droplet cavity, to experimentally generate micro-flows within the envelope of the drop. We 3D map these optically induced flows by using fluorescent nanoparticles; which reveals circular micro-streams. The flows are parametrically studied and, as expected, exhibit an increase of rotation speed with optical power. The flow is non-circular only when we intentionally break the axial symmetry of the droplet. Besides the fundamental interest in light-flow interactions including in opto-fluidic cavities, the optically controlled flows can serve in bringing analytes into the maximum-power region of the microcavity.
arXiv: Optics, 2015
Liquids serve microcavity research ever since Ashkins studies on optical resonances in levitating... more Liquids serve microcavity research ever since Ashkins studies on optical resonances in levitating droplets to recent optofluidic resonators. Droplets can provide optical quality factor (Q) in proximity to the limit restricted by water absorption and radiation loss. However, water micro-drops vaporize quickly due to their large area to volume ratio. Here we fabricate a water-air interface that almost entirely surrounds our device, allowing for more than 1,000,000 recirculations of light (finesse). We sustain the droplets for longer than 16 hours using a nano-water-bridge that extends from the droplet to a practically-unlimited distant-reservoir that compensates for evaporation. Our device exhibits surface tension 8000-times stronger than gravity that self-stabilizes its shape to a degree sufficient to maintain critical coupling as well as to resolve split modes. Our device has 98 percents of their surrounding walls made strictly of water-air interfaces with concave, convex or saddle ...
Energy exchange between light and sound was first suggested by Brillouin in 1922. After Townes es... more Energy exchange between light and sound was first suggested by Brillouin in 1922. After Townes established the phonon maser theory, coherent generation of intense hypersonic waves was observed together with stimulated Brillouin Scattering. Here we repeat these experiments, but with capillary-waves that are unique to the liquid phase of matter and relates to attraction between intimate fluid particles. We fabricate resonators that co-host capillary and opticalmodes, control it to operates at its non resolved sideband, and observe stimulated capillary scattering and coherent excitation of capillary resonances at kHz rates (that one can hear in audio files recorded by us). By exchanging energy between electromagnetic and capillary waves, we bridge interfacial tension phenomena at the liquid phase boundary to optics, and might impact optofluidics by allowing optical control, interrogation and cooling of water waves.
Photonics Research, 2019
We fabricate a tapered fiber coupler, position it near an ultrahigh-Q resonator made from a micro... more 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 μm3. Both pump and Raman laser modes overlap with the liquid phase instead of just residually extending to the fluid.