High nonlinear behavior of optical reflectivity in surface plasmon resonance structures which contain amorphous As2S3 thin films

Aurelian A. Popescu; Dan Savastru; Mihai Stafe; Niculae N. Puscas

doi:10.1117/12.2323625

31 December 2018 High nonlinear behavior of optical reflectivity in surface plasmon resonance structures which contain amorphous As₂S₃ thin films

Aurelian A. Popescu, Dan Savastru, Mihai Stafe, Niculae N. Puscas

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Proceedings Volume 10977, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IX; 1097708 (2018) https://doi.org/10.1117/12.2323625
Event: Advanced Topics in Optoelectronics, Microelectronics and Nanotechnologies IX, 2018, Constanta, Romania

Abstract

The amorphous films show many physical properties which differ from the crystalline state. One of these is the optical transparency photoinduced by light with photon energies higher than optical bandgap. The phenomenon is especially large in amorphous chalcogenide films. However, the changes of optical constants are too small for optoelectronic applications. In this paper we consider structure were the amorphous As₂S₃ film is placed in a structure which forms a surface plasmon resonance structure. The reflected light is coupled with waveguide modes. The experimental studies show that high nonlinear changes may be achieved for the light intensity of 10- 12 mW when the incident angle is close to resonance. For some film thicknesses the SPR resonance was achieved with prism made from BK7 glass, which is important opportunity for applications.

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Aurelian A. Popescu, Dan Savastru, Mihai Stafe, and Niculae N. Puscas "High nonlinear behavior of optical reflectivity in surface plasmon resonance structures which contain amorphous As₂S₃ thin films", Proc. SPIE 10977, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IX, 1097708 (31 December 2018); https://doi.org/10.1117/12.2323625

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KEYWORDS

Refractive index

Chalcogenides

Reflectivity

Nonlinear optics

Plasmonics

Prisms

Waveguides

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