Výsledky vyhledávání - "Sambles, J R"

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Non-Uniqueness of Metasurfaces for Wave Transformations

Autor: Arnold, K. O., Hooper, C., Smith, J., Clow, N., Hibbins, A. P., Sambles, J. R., Horsley, S. A. R.

We show that a large family of tensorial metasurfaces can be found that perform an identical wave transformation, showing that even when the conditions of reciprocity and passivity are imposed, there still remain many solutions to the design problem.

Externí odkaz: http://arxiv.org/abs/2407.20880

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Generalising the Yagi-Uda Antenna: Designing Disordered Metamaterials to Manipulate Antenna Radiation

Autor: Capers, J. R., Stanfield, L. D., Sambles, J. R., Boyes, S. J., Powell, A. W., Hibbins, A. P., Horsley, S. A. R.

Next generation microwave communications systems face several challenges, particularly from congested communications frequencies and complex propagation environments. Taking inspiration from the Yagi-Uda antenna, we present, and experimentally test,

Externí odkaz: http://arxiv.org/abs/2306.17528

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Acoustic surface modes on metasurfaces with embedded next-nearest neighbor coupling

Autor: Moore, D. B., Sambles, J. R., Hibbins, A. P., Starkey, T. A., Chaplain, G. J.

We design, simulate, and experimentally characterize an acoustic metasurface comprising of a 1D array of open, sound-hard, cavities, modulated with beyond-nearest-neighbor (BNN) couplings in the form of additional connecting cavities embedded beneath

Externí odkaz: http://arxiv.org/abs/2212.06583

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Microwave Demonstration of Purcell Effect Enhanced Radiation Efficiency

Autor: Stanfield, L. D., Powell, A. W., Horsley, S. A. R., Sambles, J. R., Hibbins, A. P.

We experimentally demonstrate a Purcell effect-based design technique for improved impedance matching, and thus enhanced radiation efficiency from a small microwave emitter. Using an iterative process centred on comparing the phase of the radiated fi

Externí odkaz: http://arxiv.org/abs/2209.13670

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Anomalous uniform domain in a twisted nematic cell constructed from micropatterned surfaces

Autor: Atherton, T. J., Sambles, J. R., Bramble, J. P., Henderson, J. R., Evans, S. D.

We have discovered an optically uniform type of domain that occurs in Twisted Nematic (TN) cells that are constructed from substrates chemically patterned with stripes via microcontact printing of Self-Assembled Monolayers (SAM); such domains do not

Externí odkaz: http://arxiv.org/abs/0812.2961

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