Folosirea ghidurilor de unda supraconductoare la detectia rapida si eficienta a fotonilor

Cunostinte: ecuatiile lui Maxwell, ecuatiile de unda,supraconductori,

ghiduri de unda, folosirea unor programe de calcul

Ghid de unda supraconductor-detector de fotoni

• Detectia luminii are loc pentru frecvente mai mari decat decat o valoare data (gapul de frecventa in supraconductor) si consta in anihilarea unor perechi de electroni Cooper si crearea unui numar de electroni normali de doua ori mai mare decat numarul perechilor Cooper distruse.

Schema unui detector de fotonicu un ghid de unda

• Viteza de faza mare, lungimea de propagare mica

Ghid de unda planar supraconductor

Distributia spatiala a modului TM0

(optim-absorbtie mare in YBCO, absorbtie mica in aur )

dGOLD = 10nm 30nm

Moduri ghidate

• Modul fundamental TE0

Moduri ghidate

• Modul TE1

Modul leaky

• Modul leaky

Ghiduri de unda supraconductoare

• Sectiunea transversala

Moduri

• (a)TE0 (b) TM0

Indicele de refractie efectiv

Indicele de refractie efectiv

Ghiduri de unda supraconductoare

• Sectiunea transversala

Moduri

• (a)TM0 (b) TM1

Puterea totala

• Puterea totala

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2),(

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Bibliografie• 1. V. A. Popescu, N. N. Puscas, G. Perrone, Sensitivity of traveling wave photodetectors in

superconducting box-shaped plasmon-polariton optical waveguides, Journal of Superconductivity and Novel Magnetism, Published online, 31 July 2010

• 2. V. A. Popescu, N. N. Puscas, G. Perrone, Power absorbtion efficiency in superconducting box-shaped optical waveguides, Journal of Superconductivity and Novel Magnetism, Published online, 18 June 2010

• 4. V. A. Popescu, Increase the power absorbtion efficiency in superconducting waveguides, Optoelectronics and Advanced Materials – Rapid Communications (OAM-RC) Vol. 4, ISS 5, pag. 735 – 739, (2010)

• 5. V. A. Popescu, N. N. Puscas, Comparison between TE and TM modes in superconducting multilayer optical planar waveguides, Optoelectronics and Advanced Materials – Rapid Communications (OAM-RC) Vol. 4, ISS 8, pag. 1102 – 1105, (2010)

• and Advanced Materials (JOAM), Vol. 11, ISS 6, pag. 777-781, (2009) • 9. V. A. Popescu, N. N. Puscas, Determination of field profile in multiple superconducting

quantum well optical planar waveguides, Optoelectronics and Advanced Materials – Rapid Communications (OAM-RC) Vol. 3, ISS 10, pag. 982 – 984, (2009)

• 10. V. A. Popescu, Power absorption efficiency in plasmon - polariton optical superconducting planar and rib waveguides Optoelectronics and Advanced Materials – Rapid Communications (OAM-RC), Vol. 3, ISS 12, pag. 1259 – 1263, (2009).

• Vasile Popescu vapopescu@yahoo.com