Tunable metamaterials fabricated by fiber drawing

Fleming, Simon; Stefani, Alessio; Tang, Xiaoli; Argyros, Alexander; Kemsley, Daniel; Cordi, James; Lwin, Richard

doi:10.1364/josab.34.000d81

Cited by 20 publications

(16 citation statements)

References 20 publications

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“…The ability to fiber-draw PU and the possibilities to apply its property to elastically deform have been recently demonstrated in the realization of a tunable metamaterial. 45 These mechanical properties make PU a perfect candidate for realizing a structure that can be twisted mechanically. The choice of a hollow core structure is due to both the poor optical properties of polyurethane and to the potential of this structure to be scaled at any wavelength independently from the material properties, in particular loss.…”

Section: Flexible Hollow Core Waveguidementioning

confidence: 99%

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

2018

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THz radiation is more and more commonplace in research laboratories as well as in everyday life, with applications ranging from body scanners at airport security to short range wireless communications. In the optical domain, waveguides and other devices to manipulate radiation are well established. This is not yet the case in the THz regime because of the strong interaction of THz radiation with matter, leading to absorption, and the millimeter size of the wavelength and therefore of the required waveguides. We propose the use of a new material, polyurethane, for waveguides that allows high flexibility, overcoming the problem that large sizes otherwise result in rigid structures. With this material we realize antiresonant hollow-core waveguides and we use the flexibility of the material to mechanically twist the waveguide in a tunable and reversible manner, with twist periods as short as tens of wavelengths. Twisting the waveguide, we demonstrate the generation of modes carrying orbital angular momentum. We use THz time domain spectroscopy to measure and clearly visualize the vortex nature of the mode, which is difficult in the optical domain. The proposed waveguide is a new platform offering new perspectives for THz guidance and particularly mode manipulation. The demonstrated ability to generate modes with orbital angular momentum within a waveguide, in a controllable manner, will be beneficial to both fundamental, e.g. matter-radiation interaction, and applied, e.g. THz telecommunications, advances of THz research and technology. Moreover, this platform is not limited to the THz domain and could be scaled for other electromagnetic wavelengths.

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Section: Flexible Hollow Core Waveguidementioning

confidence: 99%

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

2018

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“…We have also fabricated these structures with wires drawn into some of the holes. The original rationale for this was to fabricate tunable metamaterials [2], however it also permits other devices including electrical sensors in fibre form.…”

Section: Polyurethane Fibres -Properties and Fabricationmentioning

confidence: 99%

Polyurethane Optical Fiber Sensors

Fleming

Large

Stefani

2019

Optical Sensors and Sensing Congress (ES, FTS, HISE, Sensors)

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“…Such fibers are available due to recent advances in using fiber drawing for fabricating metamaterials with arrays of tens to hundreds of metal wires [10][11][12][13]. Poling these structures and inducing a SON may enable tunable metamaterials [14] with potential applications in sub-diffraction imaging and waveguide devices. In this paper, we demonstrate experimentally thermal poling of fibers of~50 and ~500 tin wire array anodes, arranged in concentric rings.…”

Section: Introductionmentioning

confidence: 99%

Thermal poling of multi-wire array optical fiber

Huang

Hayashi

et al. 2018

Opt. Express

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We demonstrate in this paper thermal poling of multi-wire array fibers, which extends poling of fibers with two anodes to ~50 and ~500 wire array anodes. The second harmonic microscopy observations show that second order nonlinearity (SON) layers are developed surrounding all the rings of wires in the ~50 anode array fiber with poling of 1.8kV, 250°C and 30min duration, and the outer rings of the ~500 anode array fiber at lower poling temperature. Our simulations based on a two-dimensional charge dynamics model confirm this can be explained by the self-adjustment mechanism, and show the SON layers are induced from the outer rings to the inner rings.

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Tunable metamaterials fabricated by fiber drawing

Cited by 20 publications

References 20 publications

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

Polyurethane Optical Fiber Sensors

Thermal poling of multi-wire array optical fiber

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