Optical guided wave structures

In addition to studies of diacetylene single crystals, current research, activities are focused on studies of the second X and third x order nonlinear optical responses of disubstituted diacetylene polymer films as active optical guided wave structures. Diacetylene polymers possess X values comparable to germanium(j 7). In the first stage, three major questions are being addressed ... 

Let us consider a multilayer structure plotted schematically in Fig. 1. It will be taken as a fundamental building block of any more complex guided-wave structure considered here. Let the optical wave propagate along the longitudinal coordinate z, and x is the transversal coordinate. 

Miller BL (2010) Nano-structured silicon optical sensors. In Zourob MLA (ed) Optical guided-wave chemical and biosensors II, vol 8, p 3 Springer-Verlag Berlin, Heidelberg Nirschl M, Reuter F, Voros J (2011) Review of transducers principles for label-free biomolecular interaction analysis. Biosensors 1 70... 

Chu, S.T. and Chaudhuri, S.K., 1989, A finite-difference time domain method for the design and analysis of guided-wave optical structures, J. Lightwave Technol. 7 2033-2038. 

Two of the advantages of using such materials are flexibility in the fabrication of optical structures and the tailoring of optical properties through material engineering. For application in guided-wave nonlinear optical devices high optical quality and low dielectric constant are but two of the requisite properties. 

Another model-free method for active damage detection is based on directional transducers. For passive sensing. Section 16.9 has already discussed the use of directional strain rosettes (both piezo and optical) to effectively detect an acoustic source without the need for a structural model. For active sensing, directional transmission as well as reception of guided wave can be achieved with phased-array transducers. 

The examples of the second category of devices will be guided-wave optics, in which successive deposition of L-B films can be used to fabricate a waveguide or a composite waveguide. In principle, this method offers tremendous flexibility to fabricate many unusual waveguide structures. However, it is very difficult to maintain structural correlation and uniform layer-to-layer deposition for thousands of layers. Our experience has been... 

A number of studiesof the nonlinear optical properties of polydiacetylene multilayers have been undertaken. It is obvious from these investigations that there is a strong possibility.that these materials have applications in integrated optics as wave guide materials. However this will be dependent on the ability to control morphology and structure in these layers, thus indicating the... 

Duguay, M. A. Kokubun, Y. Koch, T. Pfeiffer, L., Antiresonant reflecting optical wave guides in Si02 Si multilayer structures, Appl. Phys. Lett. 1986,49, 13 15... 

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