Focusing of electromagnetic waves into a biaxial crystal

✍ Scribed by J.J. Stamnes; G.S. Sithambaranathan; M. Jain; J.K. Lotsberg; V. Dhayalan

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 416 KB
• Volume: 226
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2003.09.007

✦ Synopsis

We derive representations suitable for studying the focusing of electromagnetic waves through a plane interface into a biaxial crystal. To that end, we start from existing exact solutions for the transmitted field due to an arbitrary threedimensional wave that is incident upon a plane interface separating an isotropic medium and a biaxially anisotropic crystal for the case in which the interface normal is along one of the principal axes of the crystal. For extra-paraxial focusing geometries we derive explicit expressions for the focused field that are well suited for efficient numerical evaluation. For paraxial focusing geometries we present simplified integral representations that are valid also in the limit as the biaxial crystal reduces to a uniaxial or an isotropic medium. Numerical results for focused paraxial fields are presented and interpreted physically.