Quantum Optics with Single-photon Nanoantenna

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, Türkiye

Tezin Onay Tarihi: 2019

Tezin Dili: İngilizce

Öğrenci: OĞUZHAN YÜCEL

Asıl Danışman (Eş Danışmanlı Tezler İçin): Alpan Bek

Eş Danışman: Serkan Ateş

Özet:

Single-photon sources (SPSs) are at the core of quantum technologies with their purely non-classical light emission. In this connection; quantum dots, diamond NV centers, trapped-ions are some of important SPSs. Besides all these, practicality on-chip applications of two dimensional materials, room temperature operation, high brightness and photostability make hexagonal Boron Nitride (hBN) defects hot topic for research. In this work, I studied hBN color centers together with plasmonic nanoantennae in order to enhance the performance of single photon emission. First, computationally I investigate quality factors, absorption and scattering properties of plasmonic nanoantennae and their light focusing features into ultra small volumes. Fabrication of nanoantennae are realized by size and shape optimization in the direction of computations. Thereafter, hBN defect centers are hunted using u-photoluminescence spectroscopy. Power-resolved and angle-resolved measurements are performed to characterize a specific defect center. Photon statistics of hunted color centers are made via single-photon detectors in a Hanbury-Brown-Twiss interferometer. Second-order correlation measurements show that our defect centers exhibit antibunched photon emission. In the coupling phase, Emission characteristics of a single defect center is modified using plasmonic nanoantennae. By dewetting thin films on hBN multilayers, plasmonic nanoantennae are obtained in a controllable way with no harm on the defect. A very same defect is investigated with and without nanoantenna in order to demonstrate clearly the modification of its emission. Based on the film thickness in dewetting process, on-demand enhancement and quenching effects are observed. For a true deterministic coupling, a further electromagnetic simulation is employed in the light of experiments.