INTEGRATED PHOTONIC DEVICES AND COMPONENTS FOR LINEAR, NONLINEAR AND QUANTUM OPTICAL APPLICATIONS - Archive ouverte HAL Accéder directement au contenu
Thèse Année : 2019

INTEGRATED PHOTONIC DEVICES AND COMPONENTS FOR LINEAR, NONLINEAR AND QUANTUM OPTICAL APPLICATIONS

DISPOSITIFS ET COMPOSANTS PHOTONIQUES INTÉGRÉS POUR DES APPLICATIONS OPTIQUES LINÉAIRES, NON LINÉAIRES ET QUANTIQUES

Résumé

Photonic technologies hold the potential to replace electronic technologies in near future by solving most of the drawbacks of the electronic circuits. Generation and manipulation of photons in an integrated waveguide-based platform are preferred over bulk-optical components, mainly due to their compactness, stability, scalability, connectivity, reproducibility, and low power consumptions. Sophisticated fabrication techniques have enabled to design low-loss intricate planar and non-planar architectures consisting of several twists and turns. Optical directional couplers (DCs), polarization beam splitters (PBSs), microring resonators (MRRs), etc. are some of the indispensable components of the photonic circuits having a plethora of applications in the linear, nonlinear, and quantum optical applications. Silicon (Si) has been the preferred material to design the photonic components due to the high refractive-index, low-loss, low-cost, and high nonlinearity. A corpus of works has been done to shrink the overall device footprint during the last few decades. At the beginning of the dissertation, a novel scheme to miniaturize the existing designs of optical DCs and PBSs based on off-centered, asymmetric, and hybrid dielectric slot waveguides is discussed. Slot dimensions and positions are optimized to achieve maximum coupling coefficient (> 88% enhancement) between two adjacent silicon wire-waveguides. The scheme leads to the device-length of 0.9 um, and 1.1 um, for the DC and the PBS, respectively, which is a signi ficant improvement over their contemporary counterparts. To obtain ripple-free broadband band-pass or band-rejection fi lters, serially coupled MRRs have been utilized which occupy large space on a chip. To overcome this issue, non-concentric (off-axis) nested MRR has been proposed in this thesis work that reduces the fi lter-size without compromising its performance, thereby enabling high-density photonic integration on-chip. High thermo-optic coefficient of Si is the Achilles heel of the silicon-on-insulator MRR based electro-optic modulators (EOMs). Off-axis MRR also helps to mitigate the thermal red-shift in the spectral response of an MRR which facilitates its applicability to achieve athermal EOM. By further improvement in non-concentric nested MRRs, it is possible to attain and maintain high quality-factor and high extinction-ratio with a fabrication tolerance of 10-20%. Initial experiments on nested MRRs confi rm the theoretical predictions. Such nested con gurations will be highly efficient in bio-sensing and quantum applications for a broad ambient temperature range. The Kerr nonlinearity of the microresonators has been exploited through a narrow line-width continuous-wave laser source for the generation of equispaced coherent frequency lines known as the optical frequency comb (FC). Most of the nonlinear materials used to generate FC, including Si, exhibit nonlinear losses and free-carrier effects in the telecom wavelength range. In the next part of the thesis, an analytical model of FC in the presence of nonlinear losses, free-carrier absorption, and dispersion effects has been developed, which capacitates us to explain several experimental results previously obtained. Further, numerical simulations explore that, using dual-pump, it is possible to generate tunable FC and synchronous all-optical buffers, which are robust to the writing-jitters, 3rd order dispersion, and Raman effect. Apart from linear and nonlinear applications, integrated optical devices provide an efficient testbed for the realization of the invincible quantum technologies. In the fi nal portion of the dissertation, efficient pumping schemes have been discussed to generate continuous variable bipartite and multipartite entanglement in different waveguide-pairs, simultaneously, using an integrated 5X5 periodically poled lithium niobate waveguide array through spontaneous parametric down conversion.
French not available
Fichier principal
Vignette du fichier
Final PhD Thesis Raktim Haldar 14EC91R07 IITKGP Nov 2019.pdf (131.21 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

tel-02469076 , version 1 (06-02-2020)

Identifiants

  • HAL Id : tel-02469076 , version 1

Citer

Raktim Haldar. INTEGRATED PHOTONIC DEVICES AND COMPONENTS FOR LINEAR, NONLINEAR AND QUANTUM OPTICAL APPLICATIONS. Optics / Photonic. PhD, 2019. English. ⟨NNT : ⟩. ⟨tel-02469076⟩

Collections

CNRS TDS-MACS
287 Consultations
6 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More