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Abstract

In order to use the large, electro‐optic coefficient of a nonlinear optical ionic crystal, 4‐(p‐dimethylaminostyryl)‐1‐methylpyridinium tosylate (DAST), a channel optical waveguide structure is needed. We successfully fabricated a waveguide using two methods: by a dry‐etching technique and by photo‐bleaching. Because DAST has a large optical loss, parts of the waveguide should be composed of a transparent polymer. We used photolithography and a reactive ion etching method to fabricate a serially grafted (conjunct) waveguide of DAST with a transparent polymer waveguide. The waveguide was also fabricated by photobleaching, whereby the refractive indices of the crystal’s a‐ and b‐axes were decreased by degrading the crystal. The cladding part of the DAST waveguide was photobleached by irradiating with UV light. The under‐ and over‐cladding layers of these channel waveguides were composed of a UV‐cured resin that did not dissolve the DAST crystal. The loss of the crystal waveguide for the crystal b‐direction was around 10 dB/cm, due to the scattering loss of the DAST single crystal.

Studies on the Growth and Microhardness, Dielectrics and Photoconductivity of NLO Material Ammonium acid phthalate

“…This technology is continuing to establish and the improvement in the development of lasers and higher nonlinear optical materials have resulted in a variety of commercially available nonlinear optical devices [1]. Among nonlinear optical (NLO) materials, organic materials have involved greater attention due to their large optical susceptibilities, inherent ultrafast response times and high damage resistance when compared to other materials [2]. The search for new materials with high optical nonlinearity is important for both academic and industrial purposes.…”

Optimized geometry, vibration (IR and Raman) spectra and nonlinear optical activity of p-nitroanilinium perchlorate molecule: A theoretical study

“…Nonlinear optical (NLO) materials have gathered great attention in recent years with respect to their potential applications in various fields, such as electro-optic modulation, frequency conversion, optical parametric oscillations, optical communication and optical computing [1][2][3][4]. In these fields, organic materials have some advantages over their inorganic counterparts, and it is stated that organic materials may eventually replace the inorganic ones in industrial applications [5].…”

Synthesis, crystal growth, characterization and structure–NLO property relationship in 1,3-bis(4-methoxyphenyl)prop-2-en-1-one single crystal

“…Organic materials with very large second-order nonlinear optical (NLO) susceptibilities have attracted a lot of attention because of their potential applications in electro-optic modulation [1][2][3][4], frequency conversion [5,6] and THz wave generation [7]. Organic materials offer versatile flexibility to tailor the structure through simple functional substitution/derivatization and hence the possibility of fine-tuning the optical properties of these materials [6].…”