Semi-guided plane wave reflection by thin-film transitions for angled incidence
| Autor: | Hugo Hoekstra, Fehmi Civitci, Manfred Hammer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Permittivity
Plane of incidence Scalar (mathematics) Plane wave slab waveguides 02 engineering and technology 01 natural sciences 010309 optics numerical / analyticalmodeling 020210 optoelectronics & photonics Optics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Boundary value problem EWI-25284 Electrical and Electronic Engineering Ansatz Physics Total internal reflection Guided wave testing Integrated Optics business.industry thin-film transitions Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials IR-92684 business |
| Zdroj: | Optical and quantum electronics, 46(3), 477-490. Springer |
| ISSN: | 0306-8919 |
| DOI: | 10.1007/s11082-013-9789-7 |
| Popis: | The non-normal incidence of semi-guided plane waves on step-like or tapered transitions between thin film regions with different thicknesses, an early problem of integrated optics, is being reconsidered. As a step beyond the common effective index picture, we compare two approaches on how this problem can be tackled—at least approximately—by nowadays readily available simulation tools for integrated optics design. Accepting the scalar approximation, using an ansatz of harmonic field dependence on the position along the interface, the 3-D problem reduces to a 2-D Helmholtz problem, for guided wave input and transparent-influx boundary conditions, with an effective permittivity that depends on the incidence angle. Alternatively, one complements the structure with a second mirrored interface, such that the 2-D cross section of a wide multimode rib waveguide emerges. Constraints for transverse resonance then permit to translate the propagation constants of its polarized modes into discrete samples of the phase changes experienced by an in-plane guided wave upon total internal reflection at the sidewalls. |
| Databáze: | OpenAIRE |
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