Abstract
Abstract Plasmonics is a rapidly developing field at the boundary of fundamental sciences and device engineering, which exploits the ability of metal nanostructures to concentrate electromagnetic radiation. The principal challenge lies in achieving an efficient conversion of the plasmon-concentrated field into some form of useful energy. To date, a substantial progress has been made within the scientific community in identifying the major pathways of the plasmon energy conversion. Strategies based on the hot electron injection and the near-field energy transfer have already shown promise in a number of proof-of-principle plasmonic architectures. Nevertheless, there are several fundamental questions that need to be addressed in the future to facilitate the transition of plasmonics to a variety of applications in both light amplification and optical detection. Of particular interest is a plasmon-induced resonance energy transfer (PIRET) process that couples the plasmon evanescent field to a semiconductor absorber via dipole-dipole interaction. This relatively unexplored mechanism has emerged as a promising light conversion strategy in the areas of photovoltaics and photocatalysis and represents the main focus of the present minireview. Along these lines, we highlight the key advances in this area and review some of the challenges associated with applications of the PIRET mechanism in nanostructured systems.
Highlights
Plasmonics is a rapidly developing field at the boundary of fundamental sciences and device engineering, which exploits the ability of metal nanostructures to concentrate electromagnetic radiation
ΑSP ( ω) αsemi ( ω) where n = 4–6 depending on whether the dipoles are considered as surface or point like, α is the absorbance coefficient, EPIRET is the exciton transfer efficiency, and R0 is the donor-acceptor distance corresponding to a 50% efficiency
The results of this study clearly demonstrated the existence of different plasmonic enhancement mechanisms in the near-field regime
Summary
Abstract: Plasmonics is a rapidly developing field at the boundary of fundamental sciences and device engineering, which exploits the ability of metal nanostructures to concentrate electromagnetic radiation. Of particular interest is a plasmon-induced resonance energy transfer (PIRET) process that couples the plasmon evanescent field to a semiconductor absorber via dipole-dipole interaction This relatively unexplored mechanism has emerged as a promising light conversion strategy in the areas of photovoltaics and photocatalysis and represents the main focus of the present minireview. Employing PIRET mechanism for light energy conversion in light-harvesting or light-emitting devices represents a fast emerging field of plasmonics, which offers the possibility of surpassing the 4n2 geometrical optic limit of absorption/emission enhancement (see Figures 2 and 3) [36, 48] Along these lines, we will highlight the basic principles of PIRET in metal-semiconductor systems and describe how PIRET is currently used by PV and light-emitting schemes. We will highlight some recent advances in the development of spectroscopic tools for quantifying the plasmon-exciton energy transfer quantum efficiency in plasmonic systems and provide an outlook of the emerging concepts for the application of PIRET processes in light conversion applications
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