An embodiment provides an apparatus, including: an input device having one or more keys; and a controller receiving input from the one or more keys; one or more of the one or more keys having a recessed surface relative to a bezel surface of the input device; the recessed surface responding to user input in the absence of mechanical displacement. The outer surface further includes first and second inclined surfaces that increase in distance from each other with increasing distance from the plasmon exciting part, and a front end face. A search section is a user input section within which a user is permitted to input at least one of an XPATH expression and a text string. Each of polarizing elements is adapted to render a unique polarization to the light signals emitted by a respectively corresponding one of the modules. A similar architecture using switches numbering N of at least a 1\xd7N switch type are also set forth.