1,721,001 research outputs found
Coherent all-optical signal processing using fibre-optic metadevices
No full textThis Thesis merges the physics of metamaterials with optical fibre technology in order to demonstrate low-power, high-bandwidth signal processing applications. Control over optical absorption using linear coherent interactions of light beams with metasurfaces of deeply subwavelength thickness offers a range of novel opportunities. Here I report on:♦ The first demonstration of a fibre-optic metadevice for coherent all-optical signal processing. The fibre metamaterial has been integrated and packaged resulting in a device that is compatible with standard fibre-optics components.♦ All-optical signal switching, effective nonlinearity and logical functions XOR, NOT and AND performed within a coherent fibre network at wavelengths between 1530 and 1565 nm. The metadevice has been tested at up to 40 Gbit/s with energy consumption as low as 2.5 fJ/bit.♦ Dark pulse generation, selective transmission/absorption of 1 ps pulses and all-optical pulse shaping in the telecommunications C-band with 1 THz bandwidth in-fibre.♦ The first demonstration of a fibre-optic plasmonic/metamaterial device for data security applications. I introduced the concept of coherent cryptography, an optical layer secure communication protocol that does not rely on nonlinear optical processes but instead uses energy redistribution of coherent optical waves interacting on a metamaterial absorber. I demonstrated different types of encryption modes and reported a scheme providing perfect secrecy.♦ Nonlinear control of coherent absorption in a nonlinear fibre network containing a metamaterial absorber. I exploited power-dependent phase retardation arising from the Kerr effect for all-optical noise suppression, power-limiting, pulse restoration, pulse splitting and signal transfer between carrier wavelengths.In addition, I have developed and fabricated fibre metadevices, which have enabled:♦ The first demonstration of coherent perfect absorption and transmission for a single photons in a stabilized quantum fibre network by collaborators.To conclude, this Thesis investigates all-optical solutions provided by plasmonic metamaterials for coherent signal processing within fibre networks. The above proof-of-principle demonstrations show the appropriateness of such metasurfaces for fibre integration and illustrate application opportunities ranging from all-optical switching and pulse shaping to optical encoding and stabilization of fibre-optic classical and quantum information networks
Filtering of quantum states with plasmonic metamaterial absorber
No full textWe use single-photon interference on a metamaterial absorber to demonstrate quantum state filtering by dissipation, exploiting the metamaterial’s ability to distinguish between symmetric and anti-symmetric superpositions of a two-path wave function
Coherent network phase stabilization dataset
No full textDataset file for "Phase stabilization of a coherent fibre network by single-photon counting" in Optics Letters.</span
Coherent cryptography with dissipative all-optical metamaterial gates
No full textWe demonstrate a new type of secure optical communication based on dissipative metamaterial logic gates that encrypt and decrypt information in an all-optical telecommunication fibre network with mutually coherent signal channels
Coherent perfect absorption and switching in a fiberized quantum network with plasmonic metadevice
No full textIn this report we provide the first demonstration of a fully fiberized quantum network with a fiber-integrated metamaterial as a dissipative switching element. Using the phenomenon of coherent absorption in plasmonic metamaterials we achieve high-contrast control of the single photon absorption probability and demonstrate switching application
A fiberized metadevice for ultrafast all-optical signal processing and picosecond dark pulse generation
No full textOptical limiting and noise suppression in fiber network through coherent control of absorption in plasmonic metamaterial
No full textWe demonstrate that in a nonlinear fibre optical network coherent interaction of light with a plasmonic metamaterial can be used for power-limiting as well as noise reduction applications
Dataset for Nonlinear control of coherent absorption and its optical signal processing applications
No full textDataset supports the paper:
Xomalis A, Jung Y, Demirtzioglou I, Lacava C, Plum E, Richardson D, Petropoulos P, Zheludev N, "Nonlinear control of coherent absorption and its optical signal processing applications," APL Photonics 4, 106109 (2019).</span
Data for 'Coherent Perfect Absorption of Single Photons in a Fibre Network'
Full text linkResearch data for the paper
Vetlugin, A. N., Guo, R., Xomalis, A., Yanikgonul, S., Adamo, G., Soci, C., & Zheludev, N. (Accepted/In press). Coherent Perfect Absorption of Single Photons in a Fibre Network. Applied Physics Letters.</span
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