42,628 research outputs found
Dataset supporting journal article "Continuous space-time crystal state driven by nonreciprocal optical forces"
No full textThis dataset supports the publication: Continuous Space-Time Crystal State Driven by Nonreciprocal Optical Forces by Venugopal Raskatla, Tongjun Liu, Jinxiang Li, Kevin F. MacDonald, and Nikolay I. Zheludev
in JOURNAL: Physical Review Letters
This file contains a representative set of oscillator positional time-series data, from which spectral density and order parameters (Figs. 3 and 4) are derived.
The project was sponsored by:
Next Generation Metrology Driven by Nanophotonics
EPSRC EP/T02643X/1
Dataset available under a CC BY 4.0 licence</span
Dataset supporting journal article "Time translation symmetry, ergodicity, and entropy dynamics in a time crystal driven by optical interaction forces"
No full textThis dataset supports the publication: Time Translation Symmetry, Ergodicity, and Entropy Dynamics in a Time Crystal Driven by Optical Interaction Forces by Tongjun Liu, Venugopal Raskatla, Jinxiang Li, Kevin F. MacDonald, and Nikolay I. Zheludev in JOURNAL: Newton
The file contains time series transmissivity data from which Figures 2 and 3 are derived.
The project was sponsored by:
The Future Advanced Metrology Hub for Sustainable Manufacturing
EPSRC EP/Z53285X/1
Next Generation Metrology Driven by Nanophotonics
EP/T02643X/1
Dataset available under a CC BY 4.0 licence</span
Pico- and nanophotonics of reconfigurable metamaterials
No full textPicophotonics is the emerging science of light-matter interactions at the subnanometre scale. In nanomechanical metamaterials (NMs), picometric movements driven by thermal forces can be amplified by optical forces, opening up a novel way to explore their physics and applications. In this work I have: • Designed and constructed a unique apparatus for investigation of thermal fluctuations and directional asymmetry of optical properties in NMs. This experimental setup is part-fiberized for stability, operating at telecommunications C-band wavelengths. • For the first time, observed thermal fluctuations in the optical properties of metamaterials. High-frequency time-domain fluctuations of the optical properties of NMs are directly linked to picometre thermal motion of their components and can give information on fundamental mechanical frequencies and damping of mechanical modes. At room temperature the magnitude of metamaterial transmission and reflection fluctuations is of order 0.1% but may exceed 1% at optical resonances. • Demonstrated, for the first time, that the natural frequencies and thermal fluctuation amplitudes of NMs can be optically controlled at µW/µm2 intensities. The few - MHz natural frequencies of beams shift up to 3.6% and few tens of pm displacement amplitudes of thermal fluctuations vary up to 4.3% with light intensity of 0.8µW/µm2 , providing active control of frequency response and may serve as a basis for bolometric, mass and stress sensing. • For the first time, reported asymmetric transmission in a nanomechanical metamaterial driven by optical forces. I have experimentally demonstrated in NMs that resonant excitation of optical and mechanical sub-systems can lead to profound light-induced transmission asymmetry reaching 16% at µW power levels, making it suitable for a range of laser technology and fibre telecom applications. • Shown, for the first time, that a free-standing, homogenous dielectric thin film can exhibit an optical magnetic response, i.e. without metamaterial nanostructuring. Indeed, such a response is an essential feature of homogeneous dielectric films at Fabry–Perot resonances, which are formed by the interference of electromagnetic multipoles, including the magnetic dipole
Dataset For 'Pico- and Nanophotonics of Reconfigurable Metamaterials'
No full text This dataset supports the thesis entitled 'Pico- and Nanophotonics of Reconfigurable Metamaterials' and it contains two files: a ReadMe file describing the details of data and a zip file including the raw data.</span
Reconfiguring metamaterials with the pressure of light
No full textThe optical response of a nanowire metamaterial can be controlled by resonant ponderomotive nonthermal optical forces. The coupling of optical and mechanical resonances facilitates a strong optical nonlinearity enabling all-optical transmission modulation at microwatt power levels
Dataset - optical control of brownian motion
Get PDFThis dataset supports the publication: Optical Control of Nanomechanical Brownian Motion Eigenfrequencies in Metamaterials
Nano Letters: https://doi.org/10.1021/acs.nanolett.1c04900
The file contains the data for figures 1c, 2, 4, and S1.
[Figures 1a,b are schematic diagrams; Figure 3 is derived from the data of Figure 2]</span
Transmission asymmetry in all-dielectric opto-mechanical metamaterials
No full textWe report on the manifestation of transmission asymmetry in nano-opto-mechanically reconfigurable all-dielectric metamaterials.The reversible structural reconfiguration of photonic metamaterials manufactured on free-standing elastic nano-membranes, under the action of external stimuli, can drive modulation of their optical properties at high (up to GHz) frequencies. Such nano-mechanical metamaterials can be engineered to present substantive electro-, magneto- and acousto-optic switching coefficients; to manifest large effective optical nonlinearities and bistability; and to enable the interrogation and exploitation of optical phenomena that are extremely small, or indeed non-existent, in bulk media.Resonantly enhanced optical forces generated among the component parts of a free-standing photonic metamaterial can be of comparable magnitude to the elastic restoring forces arising from nanoscale structural deformation. As such, they can be engaged to dynamically reconfigure the structure, providing a mechanism for strong opto-mechanical nonlinearity dependent upon the direction of light propagation, leading to transmission asymmetry at μW/μm2 intensities
Optical Control of Nanomechanical Eigenfrequencies and Brownian Motion in Metamaterials
Get PDFNanomechanical photonic metamaterials provide a wealth of active switching,
nonlinear and enhanced light-matter interaction functionalities by coupling
optically and mechanically resonant subsystems. Thermal (Brownian) motion of
the nanostructural components of such metamaterials leads to fluctuations in
optical properties, which may manifest as noise, but which also present
opportunity to characterize performance and thereby optimize design at the
level of individual nanomechanical elements. We show that Brownian motion in an
all-dielectric metamaterial ensemble of silicon-on-silicon-nitride nanowires
can be controlled by light at sub-{\mu}W/{\mu}m2 intensities. Induced changes
in nanowire temperature of just a few Kelvin, dependent upon nanowire
dimensions, material composition, and the direction of light propagation, yield
proportional changes of several percent in the few-MHz Eigenfrequencies and
picometric displacement amplitudes of Brownian motion. The tuning mechanism can
provide active control of frequency response in photonic metadevices and may
serve as a basis for bolometric, mass and micro/nanostructural stress sensing.Comment: 11 pages, 5 figure
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