Fig. 1. Schematic diagram of the MDM structure model composed of silver and PVA, in which: the orange area represents the silver film with a thickness of d₁; the blue area represents the dielectric PVA with a thickness of d₂, the inner radius of the upper silver film is R, and the central angle corresponding to the structure is θ

Fig. 2. (a) Power curves of quantum dots in different polarization states; (b−d) electric field profiles of quantum dots in different polarization states at 515 nm wavelength

Fig. 3. Power curves and Purcell factors of quantum dots for the MDM structures with different center angles

Fig. 4. Power curves and Purcell factors of quantum dots for the MDM structures with different radii

Fig. 5. Luminous power curves of quantum dots for the MDM structures with different dielectric layer thicknesses and refractive indexes

Fig. 6. Luminous power curves and Purcell factors of quantum dots for the MDM structures with different upper and lower silver film thicknesses

Fig. 7. The electric field distribution diagrams, power curves and Purcell factors for quantum dots in metal-dielectric-metal structure, metal-dielectric structure and metal structure at 490 nm wavelength

Fig. 8. Far-field fluorescence power curves of (a) two coherent dipole sources and (b) two incoherent dipole sources located at different positions in the MDM structure and flexible PVA substrate

Fig. 9. Preparation process flow chart of MDM structure

Fig. 10. MDM structures. (a) planar; (b) curved (top view)

Fig. 11. (a) Bright field image of MDM structure under optical microscope; (b) dark field luminescence image under 375nm laser irradiation

Fig. 12. PL collection process

Fig. 13. PL curve obtained from the experiment