Harvesting of surface plasmon polaritons: Role of the confinement factor

Gong, Zu-YongFudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Collaborat Innovat Ctr Chem Energy Mat, MOE Key Lab Computat Phys Sci,Dept Chem, Shanghai 200433, Peoples R China. (författare)

Harvesting of surface plasmon polaritons : Role of the confinement factor

QC 20201006
Surface plasmon polaritons (SPPs) are propagating waves generated at the interface of a metal (metamaterial) and a dielectric. The intensity of SPPs often exponentially decays away from the surface, while their wavelengths can be tuned by the confinement effect. We present here a computational method based on quantum-mechanical theory to fully describe the interaction between confined SPPs and adsorbed molecules at the interface. Special attention has been paid to the roles of the confinement factor. Taking a prototype dye sensitized solar cell as an example, calculated results reveal that with the increase in the confinement factor in metal/dielectric interfaces, the breakdown of the conventional dipole approximation emerges, which allows efficient harvesting of SPPs with low excitation energies and, thus, increases the efficiency of the solar energy conversion by dye molecules. Furthermore, at the metamaterial/dielectric interface, SPPs with large confinement factors could directly excite the dye molecule from its ground singlet state to the triplet state, opening an entirely new channel with long-living carriers for the photovoltaic conversion. Our results not only provide a rigorous theory for the SPP-molecule interaction but also highlight the important role played by the momentum of the light in plasmon related studies.

Xie, ZhenKTH,Teoretisk kemi och biologi(Swepub:kth)u18s22qv (författare)
Tian, GuangjunYanshan Univ, Sch Sci, Key Lab Microstruct Mat Phys Hebei Prov, Qinhuangdao 066004, Hebei, Peoples R China.(Swepub:kth)u13a4y32 (författare)
Duan, SaiFudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Collaborat Innovat Ctr Chem Energy Mat, MOE Key Lab Computat Phys Sci,Dept Chem, Shanghai 200433, Peoples R China.(Swepub:kth)u1v1iqp3 (författare)
Luo, YiUniv Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China.;Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China. (författare)
Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Collaborat Innovat Ctr Chem Energy Mat, MOE Key Lab Computat Phys Sci,Dept Chem, Shanghai 200433, Peoples R China.Teoretisk kemi och biologi (creator_code:org_t)

Av författaren/redakt...: Gong, Zu-Yong; Xie, Zhen; Tian, Guangjun; Duan, Sai; Luo, Yi

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