FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W201266714> ?p ?o ?g. }

• W201266714 abstract "Two-dimensional (2D) photonic crystals (PhCs) at near-infrared wavelengths are promising candidates for novel integrated optics applications. The main focus being on 'all PhC' monolithically integrated optical circuits. Because of well established fabrication technologies particular emphasis is on 'quasi' 2D PhCs where a 2D lattice of air holes is etched through a planar step-index waveguide providing the optical confinement in the third dimension. This approach has been successfully demonstrated both in GaAs and InP-based systems. We have studied vertical low-index-contrast structures both in GaAs and InP. These structures suffer inherently from radiation losses that are strongly affected by the air hole depth and shape. A semi-analytical 'e-model' enables out-of-plane scattering to be described by an effective imaginary dielectric constant in the air-holes which can be used in 2D finite difference time domain (FDTD) calculations. The model, once validated by 3D FDTD, allows us to deduce from optical simple slab transmission measurements the structural parameters (e.g. size, depth and form of the hole). The experimental transmission spectra are obtained with the so-called 'internal light source technique' (ILS), which allows for quantitative normalised transmission measurements, thus eliminating the uncertainties due to the in-out coupling arising in alternative characterisation techniques, i.e. end-fire. The ILS technique proved to be a versatile method without stringent limits for assessing the fabrication parameters (air-filling factor and loss) but also proved to be suitable for testing building blocks. In this thesis different building blocks were fabricated in the GaAs system and analysed using diverse modeling techniques (e.g. plane wave expansion, FDTD and coupled mode theory). The first building block was used to study contra-directional coupling of the fundamental mode with higher-order modes in channel waveguides. It is an extension of the work on waveguides with symmetric periodic corrugation to the case of multi periodicity. We showed that by breaking the translational symmetry in these structures referred to as hybrid waveguides, the number of mini-stopbands is increased and not, as one could have expected, decreased. A second building block analysed to guide light around the corner, are cavity resonant bends (CRBs). As our analysis showd that CRBs work best with non-degenerate cavity modes, different low-symmetry order cavities were studied with differ coupling coefficients between cavity and waveguides. Unfortunately, the resulting peak transmission and overall performance was below our expectations. An important building block in integrated optics are directional couplers. They have a potential for applications such as 3dB-intensity splitting or channel add-drop filtering. To reduce the coupling length, transmission measurements of a series of coupler structures of different lengths were taken. In the case of two W3 waveguides separated by a single row, the coupling length proved to be very dependent on the hole diameter in the single row. For this case the experimentally determined coupling length, which has been validated by both PWE and FDTD simulations, was of the order of 350 periods which corresponds to an absolute length of about 80 μm, a value that is small for conventional optics, but rather large for the domain of PhC optics where due to the unusually high propagation losses the integrated circuit has to be kept small. This value could, however, be reduced by a factor of at least three when reducing the ratio between the barrier hole and the nominal hole radius to 0.5. Finally we studied the waveguides needed to connect the different building blocks. The standard solution are channel waveguides, line-defects obtained by omitting a number of rows of holes. An alternative approach are coupled cavity waveguides (CCWs). They not only offer the potential for waveguiding but may also be used for non-linear optics by exploiting the special dispersion properties of CCWs (e.g. low group-velocity). A tight-binding model has been set-up that describes the interaction between the neighbouring cavities and that allows one to deduce the dispersion properties of the chain from the single cavity field distribution." @default.
• W201266714 created "2016-06-24" @default.
• W201266714 creator A5080161269 @default.
• W201266714 date "2004-01-01" @default.
• W201266714 modified "2023-09-23" @default.
• W201266714 title "Experimental and numerical investigation of two-dimensional photonic crystals for application in integrated optics" @default.
• W201266714 cites W1594873560 @default.
• W201266714 cites W1655034548 @default.
• W201266714 cites W2087531415 @default.
• W201266714 cites W2101350365 @default.
• W201266714 cites W2165648792 @default.
• W201266714 doi "https://doi.org/10.5075/epfl-thesis-2949" @default.
• W201266714 hasPublicationYear "2004" @default.
• W201266714 type Work @default.
• W201266714 sameAs 201266714 @default.
• W201266714 citedByCount "0" @default.
• W201266714 crossrefType "journal-article" @default.
• W201266714 hasAuthorship W201266714A5080161269 @default.
• W201266714 hasConcept C120665830 @default.
• W201266714 hasConcept C121332964 @default.
• W201266714 hasConcept C121684516 @default.
• W201266714 hasConcept C133386390 @default.
• W201266714 hasConcept C134786449 @default.
• W201266714 hasConcept C136525101 @default.
• W201266714 hasConcept C142724271 @default.
• W201266714 hasConcept C184880428 @default.
• W201266714 hasConcept C192562407 @default.
• W201266714 hasConcept C200687136 @default.
• W201266714 hasConcept C204787440 @default.
• W201266714 hasConcept C20788544 @default.
• W201266714 hasConcept C22799297 @default.
• W201266714 hasConcept C2777718760 @default.
• W201266714 hasConcept C41008148 @default.
• W201266714 hasConcept C42067758 @default.
• W201266714 hasConcept C49040817 @default.
• W201266714 hasConcept C71924100 @default.
• W201266714 hasConcept C75302062 @default.
• W201266714 hasConceptScore W201266714C120665830 @default.
• W201266714 hasConceptScore W201266714C121332964 @default.
• W201266714 hasConceptScore W201266714C121684516 @default.
• W201266714 hasConceptScore W201266714C133386390 @default.
• W201266714 hasConceptScore W201266714C134786449 @default.
• W201266714 hasConceptScore W201266714C136525101 @default.
• W201266714 hasConceptScore W201266714C142724271 @default.
• W201266714 hasConceptScore W201266714C184880428 @default.
• W201266714 hasConceptScore W201266714C192562407 @default.
• W201266714 hasConceptScore W201266714C200687136 @default.
• W201266714 hasConceptScore W201266714C204787440 @default.
• W201266714 hasConceptScore W201266714C20788544 @default.
• W201266714 hasConceptScore W201266714C22799297 @default.
• W201266714 hasConceptScore W201266714C2777718760 @default.
• W201266714 hasConceptScore W201266714C41008148 @default.
• W201266714 hasConceptScore W201266714C42067758 @default.
• W201266714 hasConceptScore W201266714C49040817 @default.
• W201266714 hasConceptScore W201266714C71924100 @default.
• W201266714 hasConceptScore W201266714C75302062 @default.
• W201266714 hasLocation W2012667141 @default.
• W201266714 hasOpenAccess W201266714 @default.
• W201266714 hasPrimaryLocation W2012667141 @default.
• W201266714 hasRelatedWork W1671350723 @default.
• W201266714 hasRelatedWork W1964164757 @default.
• W201266714 hasRelatedWork W1979089510 @default.
• W201266714 hasRelatedWork W2017262389 @default.
• W201266714 hasRelatedWork W2017318110 @default.
• W201266714 hasRelatedWork W2070766436 @default.
• W201266714 hasRelatedWork W2072406070 @default.
• W201266714 hasRelatedWork W2079370323 @default.
• W201266714 hasRelatedWork W2080491044 @default.
• W201266714 hasRelatedWork W2093533554 @default.
• W201266714 hasRelatedWork W2101748766 @default.
• W201266714 hasRelatedWork W2104027589 @default.
• W201266714 hasRelatedWork W2104835107 @default.
• W201266714 hasRelatedWork W2105882918 @default.
• W201266714 hasRelatedWork W2112564137 @default.
• W201266714 hasRelatedWork W2114766905 @default.
• W201266714 hasRelatedWork W2130170443 @default.
• W201266714 hasRelatedWork W2139850462 @default.
• W201266714 hasRelatedWork W2269467939 @default.
• W201266714 hasRelatedWork W150494501 @default.
• W201266714 isParatext "false" @default.
• W201266714 isRetracted "false" @default.
• W201266714 magId "201266714" @default.
• W201266714 workType "article" @default.