Abstract
We investigate the feasibility of CMOS-compatible optical structures to develop novel integrated spectroscopy systems. We show that local field enhancement is achievable utilizing dimers of plasmonic nanospheres that can be assembled from colloidal solutions on top of a CMOS-compatible optical waveguide. The resonant dimer nanoantennas are excited by modes guided in the integrated silicon nitride waveguide. Simulations show that 100-fold electric field enhancement builds up in the dimer gap as compared to the waveguide evanescent field amplitude at the same location. We investigate how the field enhancement depends on dimer location, orientation, distance and excited waveguide mode.
Highlights
The use of nano photonic sensors enable on-site real-time qualitative detection of [1,2,3,4,5] molecules or bio chemical agents with detection limit approaching to single molecule level, and leads to deep understanding of biological and chemical processes that are useful for medical diagnosis [6,7,8,9,10,11]
We show that local field enhancement is achievable utilizing dimers of plasmonic nanospheres that can be assembled from colloidal solutions on top of a CMOS-compatible optical waveguide
In this paper we have proposed a configuration that provides strong electric field enhancement by placing dimer plasmonic nanoantennas on top of an integrated silicon nitride waveguide
Summary
The use of nano photonic sensors enable on-site real-time qualitative detection of [1,2,3,4,5] molecules or bio chemical agents with detection limit approaching to single molecule level, and leads to deep understanding of biological and chemical processes that are useful for medical diagnosis [6,7,8,9,10,11]. The challenge of fabricating systems with high reproducibility in SERS response across the sensor surface is not frequently addressed To overcome this challenge, in our previous work [25],[27] an innovative method for fabricating self-organized clusters of metal nanospheres with nanometer gap spacing on diblock copolymer thin films was successfully investigated. The integration of nanoantennas with waveguides that we propose is a spectrometer building block which addresses the above challenges and only requires smaller sample solution volumes in comparison with open systems With this goal in mind, we investigate the field enhancement capability of plasmonic nanoantennas composed of nanospheres from colloidal solution located on the surface of silicon nitride (Si3N4) waveguides. We provide the performance comparison, in terms of field enhancement, between the proposed waveguide-driven nanoantenna structure and the same nanoantenna on top of a multilayer composed of silicon nitride on top of glass, all with the same thicknesses as in the waveguide case, illuminated by a plane wave
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