金刚石晶体在光学领域具有十分重要的应用价值，如何高效地提升其光学性质，并设计新型高性能光学器件，是金刚石迈向实际应用需要解决的关键科学问题。本项目拟在金刚石晶体引入表面等离激元纳米结构，研究表面等离激元共振对金刚石从深紫外到红外波段的发光增强作用。通过在所制备的高质量本征金刚石单晶及引入色心的金刚石单晶或多晶膜表面，有选择性地沉积不同种类金属纳米颗粒，设计和构筑特殊表面等离激元纳米结构；结合时域有限差分法计算分析，通过调制金属纳米颗粒的种类、介电常数、尺寸、形状，以及金刚石微纳米表面结构等因素，实现金属纳米颗粒-金刚石近场局域电磁场增强，使金刚石深紫外带间复合发光及不同色心的可见和红外发光获得共振增强；以金刚石表面等离激元纳米结构为基底，实现从深紫外到红外多波长激发的表面增强拉曼散射（SERS）。本项目的实施，将为拓展金刚石在多个研究领域的应用提供新的理论依据和实验数据。

Diamond has been widely applied in the field of optics. How to improve its optical properties and performances of the devices are the key scientific issues to realize the practical applications of diamond. In this project, we would introduce surface plasmon (SP) nanostructures on diamond and investigate its resonant enhancements on the diamond’s fluorescence from the deep ultraviolet (UV) to the infrared emissions. The SP nanostructures are fabricated by depositing selected metal nanoparticles on high quality intrinsic single crystal diamonds and single/polycrystalline diamond films with various color centers. Based on the finite-difference time-domain (FDTD) simulations, and further taking into account the dielectric constant, size and shape of the metal nanoparticles and the micro-nano structured surface of diamond beneath, the intensity of localized electromagnetic fields near the metal nanoparticles/diamond are strongly increased, and thus enhance the band-band UV emission and the color center emissions. The diamonds with SP nanostructure would also be used as surface-enhanced Raman scattering (SERS) substrate for realizing efficient SERS excited under excitations with different wavelengths. The implementation of this project would provide new theoretical and experimental data for the future application of diamond in multiple research fields.