Mid- and far-infrared localized surface plasmon resonances in chalcogen-hyperdoped silicon

Abstract

Plasmonic sensing in the infrared region employs the direct interaction of the vibrational fingerprints of molecules with the plasmonic resonances, creating surface-enhanced sensing platforms that are superior than the traditional...

Giant localized electromagnetic field of highly doped silicon plasmonic nanoantennas

“…Additionally, As the direction of the incident electric field (polarization) is parallel to the long axis of the nanorod antenna, free electrons accumulate along the shorter edge (width), stimulating the longitudinal plasmon mode at longer wavelengths (Fig. 4 c) 9 . In general, this results in substantial near-field enhancement, which is useful in sensitivity applications.…”

“…Metals' plasmonic characteristics have drawn a lot of interest recently because of their ability to create localized surface plasmon resonance (LSPR). To control LSPR intensity and confine it, nanoantennas will be a good choice due to their light-directing and harvesting properties, therefore they are involved in a variety of applications, including trapping light, near-field manipulation, and nanoscale sensing 9 . Due to weak compatibility with semiconductor manufacturing techniques and significant dissipation at optical and infrared wavelengths, the usage of metals like gold or silver is still ineffective 10 .…”

Promoting 2D Material Photodetectors by Optical Antennas beyond Noble Metals

“…[ 154 ] As a consequence, non‐metal heteroatom‐doped semiconductor plasmonic nanostructures have garnered extensive research enthusiasm in recent years in the context of their advantage in large‐scale applications enabled by their competitive material cost. Thus far, a vast number of highly compelling doped semiconductor‐based plasmonic nanomaterials have emerged such as indium tin oxide (ITO), [ 155 ] STO, [ 154 ] Te‐doped Si, [ 78 ] H‐doped MoO 3 , [ 156 ] F and In co‐doped CdO, [ 157 ] Al‐doped ZnO, [ 158 ] H‐doped MoO 3 , [ 159 ] Ga 2 FeO 4 , [ 160 ] Cu/In‐doped Cd 2 SnO 4 , [ 161 ] and so on. Compared with classical metal optical antennas, semiconductor‐based optical antennas have exhibited distinct advantages.…”

“…[174] In 2022, Wang et al unveiled that MIR LSPR can occur in Si films hyperdoped with deep-level impurity tellurium, and such LSPR can be further enhanced and spectrally extended to the FIR spectral range by fabricating 2D arrays of micrometer-sized antennas. [78] On basis of the above inspiring advancements, coupling these long-wave non-noble plasmonic optical antennas with the long-wave sensitive 2DLMs definitely represents an attractive research topic in the upcoming future.…”

“…[ 75 ] Since these materials do not contain precious elements, non‐noble optical antennas have exhibited huge advantages in terms of fabrication cost as compared to the widely explored precious metal ones (such as Au, Ag, Pt, and Pd). In addition, non‐noble metal optical antennas have exhibited resonance frequency across a substantially broad spectral range across ultraviolet (UV) to far‐infrared (FIR), [ 76–79 ] which far exceeds that of the classical noble metal antennas (normally limited to the UV to visible (vis) range due to high charge carrier concentration on the order of 10 22 –10 23 cm −3 ). [ 80 ] This enables the customization of optical antennas with highly matched effective optical windows to various 2DLMs manifesting diverse band structures (bandgap ranging from 0 to 6 eV).…”