A Meta-Nano Channel BioFET is demonstrated to decouple the electrostatics of the solution from the electrodynamics of the FET such that the Debye screening length can be electrostatically tuned to enhance the sensor output signal.

Broadband absorption of the solar radiation is important to various absorption-based devices. Enhanced light trapping in arrays of light funnels is based on strong proximity effects.

Metamaterials based on arrays of subwavelength dielectric structures have recently proved to be a viable research tool towards the realization of various photonic devices.

Broadband absorption is pivotal for the realization of green energy based on solar energy. Decoration of photovoltaic cells with arrays of subwavelength formations provides an efficient means for broadband absorption in thin films. Surface arrays of silicon light funnels (LFs) have been suggested as a promising platform to produce broadband absorption that is considerably superior to other subwavelength arrays such as the well‐known nanopillar (NP) arrays. The current study explores the underlying mechanism of broadband absorption in LF arrays. To this end, the optical near‐field of LF and NP arrays is experimentally probed using a near‐field scanning optical microscopy. It is shown that in LF arrays the near‐field increases as the array period decreases in contrast with NP arrays in which the near‐field decreases with decreasing array period. Also, the experimental near‐field of the arrays follows the numerically calculated absorption cross section of the array‐nested NPs/LFs. Therefore, the origin to the broadband absorption in compact LF arrays is due to field overlap of adjacent LFs which increases the absorption cross section of the individual LFs composing the array. This absorption cross‐sectional enhancement coupled with a higher filling ratio in compact arrays produces broadband absorption that is significantly greater than that of NP arrays.