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Semiconductor based nano-photonic structures for integrated quantum photonics

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  1. Tez No: 400465
  2. Yazar: ERMAN ERGİN
  3. Danışmanlar: PROF. DR. MARTIN J. CRYAN
  4. Tez Türü: Doktora
  5. Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2012
  8. Dil: İngilizce
  9. Üniversite: University of Bristol
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 204

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Özet (Çeviri)

This thesis presents experimental, theoretical and simulation based studies on nano-photonic structures for the newly emerging integrated quantum photonics technology. Integrated quantum photonics aims to utilize the photons to implement the concepts of quantum mechanics that offer revolutionary new methods in the fields such as computation, communication, metrology and simulation on miniature scale optical devices. We begin with discussing benefits of quantum information, quantum photonics and integrated quantum photonics in more detail in the first chapter. We demonstrate non-classical interference in a gallium nitride directional coupler which is the first demonstration in this material system, and will be discussed in the second chapter. Gallium nitride is important due to the fact that it opens a new spectral range for integrated quantum photonics, namely the blue and ultra-violet. Another contribution of this study is the enhancement in the pair generation efficiency of silicon nano-wire based single photon sources, and this will be covered in the fourth chapter. Integrated single photon sources are an essential part of integrated quantum photonics. Advancements in this field require single photon sources to be scaled down to fit in a photonics chip. When miniaturization is of concern silicon is the first thing that comes into our minds. While its high refractive iv index allows tight confinement of light and efficient guiding of light around sharp corners, its Kerr non-linearity enables generation of photon pairs through spontaneous four-wave mixing which recently attracted the attention of scientists. Here we study the pair generation in a straight waveguide and a ring resonator. We investigate the enhancement provided by the presence of the ring. Furthermore we address the well known detrimental effects of free carriers in silicon, which are generated by the high intensity pump beam, by reverse biasing the PN junction across the ring and show an enhancement in pair generation. In the second part of the thesis we focus on photonic crystal structures which are attractive due to the size reduction they offer and can have potential benefits for integrated quantum photonics applications. In Chapter 5, we present the theory behind photonic crystals and describe methods used in simulating photonics crystals. Then we provide examples from the literature which can be found in Chapter 6. In Chapter 7 we show our simulation results where we present a systematic design of a miniature size photonic crystal directional coupler and also study its tuning capabilities.

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