Mediating surface mode for intensive quasi-monochromatic evanescent wave tunneling

- Evanescent wave tunneling spectrum in three bodies system with independent temperature has been calculated with the help of rigorous coupled wave analysis.
- An intensive quasi-monochromatic tunneling peak has been induced in non-contact.
- The tunneling mode originates from the coupling between cavity modes and spoof surface modes, and is further amplified by three bodies effect.
- The spoof surface modes originate from surface phonon polariton in SiO2, and is manipulated by subwavelength structure.

In this study, a quasi-monochromatic photon tunneling peak has been achieved in substrate-comb-substrate three bodies system. The near-field tunneling peak results from coupling between spoof surface mode and cavity mode, which has been further amplified by three bodies effect. The spoof surface mode originates from phonon vibration, and is manipulated by the structure into new surface mode. As a non-contact approach to generate high intensity and narrow bandwidth tunneling mode, current study has many application points in near-field spectroscopy and energy-conversion.