Strong photon localization in mesoscopic scaled optical waveguide

• Published in: Japanese Journal of Applied Physics Vol. 34; no. 8B; pp. 4502 - 4507
• Main Authors: OHTAKA, M, HASHIMOTO, A, ITOH, T, SANTO, T, YAMAMOTO, A
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Tokyo Japanese journal of applied physics 1995
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Integrated optics. Optical fibers and wave guides; Optical and optoelectronic circuits; Localized state; Frequency characteristic; Energy gap; Density of states; Analysis method; Mesoscopic system; Photonic band; Optical waveguide; Two dimensional model; Photon
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/jjap.34.4502

Strong photon localization in mesoscopic-scaled optical waveguide structures has been analyzed through two numerical approaches. The conventional electromagnetic wave analysis and the forced vibrational analysis methods are applied to 2-dimensional mesoscopic-scaled optical waveguide structures. The results indicate that both analysis methods give similar results for the density of states, the photonic band gap and the strong photon localized states according to the introduction of aperiodic structures of the refractive indices in the waveguides. The calculated mode patterns of the midgap states in the photonic band gap indicate that the features of strongly localized states depend on the aperiodicity, and light is localized strongly within a region of several micrometers in the random aperiodic waveguide. We also discuss fabrication techniques for realistic quasi-random aperiodic structures and the smearing out effect by the cladding layer which prevents the strong localization of light.