Molecular filter on chip design

Abstract

Molecular devices have been recognized as the promising devices for future technology, especially, for electronic device applications, which have been the interesting researches of investigations [1- 4] due to the following advantages such as a small size and good environmental adapted devices. Moreover, the hybrid devices of between semiconductor and molecular electronics are also challenged and plausible. Till date, many research works have been investigated in the molecular electronic research areas in both theoretical [5-8] and experimental [9-12] works, however, many research aspects are required to investigate and remained. In this paper, we propose the use of optical tweezers for molecule/atom trapping in the modified add-drop filter for molecular filter applications. Regarding to the very promising works that have presented the use of trapped molecules (atoms) in optical waveguide for transportation [13,14], especially, the use of optical tweezers for molecule trapping is new and seems it may go a long way in the future. In principle, the trapped molecules can be transported along the waveguide surface by the gradient force. The theoretical background of optical tweezers by using an optical pulse in a modified add-drop filter (a PANDA ring) is reviewed in this work. A PANDA ring resonator is a modified optical add-drop filter, in which the required optical tweezers can be generated and obtained by using the two additional (modified) nonlinear side rings. By changing the structure of PANDA (i.e. parameters) ring and input light signals, the different output signals can be obtained. By providing and controlling the suitable input power signals in the system, the dynamic optical tweezers can be generated, tuned, and stored within the ring resonator system before reaching the desired destination via an optical waveguide. The use of a PANDA microring device is also founded in many applications such as drug delivery [15-19], hybrid transistor [20] and therapeutic applications [21]. In practice, the optical tweezers (light signals) can propagate within the optical waveguide, which means that the trapped molecules can transport to the required destinations via the surface based on the gradient potential (force) and surface plasmonic behaviors. Therefore, by using the proposed system, molecules can be trapped and transported via the suitable waveguide to the required targets with some specific molecule sizes, in which the molecular filter concept is established. In this proposed work, the device parameters were chosen closely to the fabricated device parameters, the simulation results are obtained by using the commercial MATLAB software, which is found that this device can be used to form the hybrid electronic device, in which the combination between the conventional electronics and molecular electronics can be established, moreover, the multivariable molecular filter can be formed, which can be available for high capacity molecular communication and networks.