We introduce the concept of optical printed circuit board (O-PCB) and discuss the issues regarding the miniaturization, interconnection, and integration of polymer-based photonic devices with a view to using it as a potential platform for VLSI microphotonic integration. We present new approaches to miniaturize and integrate some examples of microphotonic devices and examine the considerations regarding the design, fabrication, and characterization for miniaturization and integration for O-PCB application. Devices that we have used for our study include mode conversion adaptors, micro-ring resonator devices, multimode interference devices, arrayed waveguide gratings. Scaling rules are also discussed.

In this paper, a bow-tie-shaped nano-aperture is proposed to enhance light transmission and obtain a tiny beam spot. The transmission and focusing characteristics of the proposed aperture are analyzed numerically using a dispersive three-dimensional finite-difference time-domain (3D-FDTD) method. The spot size and transmittance enhancement of the light transmitted through the optimized aperture are approximately λ/20 and 400 times, respectively. In contrast to the bowtie antenna, the proposed nano-aperture has a bow-tie-shaped opening at its center and its surroundings are filled with metal. Thus, the transmittance enhancement can be further increased by extending the interaction area between an incident beam and the metal portion of the nano-aperture, which is accomplished by increasing the beam width of an incident light.

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