  Initiated as a cable-replacement solution, short-range wireless power
transfer has rapidly become ubiquitous in the development of modern high-data
throughput networking in centimeter to meter accessibility range. Wireless
technology is now penetrating a higher level of system integration for
chip-to-chip and on-chip radiofrequency interconnects. However, standard CMOS
integrated millimeter-wave antennas have typical size commensurable with the
operating wavelength, and are thus an unrealistic solution for downsizing
transmitters and receivers to the micrometer and nanometer scale. In this
letter, we demonstrate a light-in and electrical-signal-out, on-chip wireless
near infrared link between a 200 nm optical antenna and a sub-nanometer
rectifying antenna converting the transmitted optical energy into direct
current (d.c.). The co-integration of subwavelength optical functional devices
with an electronic transduction offers a disruptive solution to interface
photons and electrons at the nanoscale for on-chip wireless optical
interconnects.
