CAJ | 학술논문

本文设计了一种基于银-铝-银复合膜层结构的金属亚波长缝-槽结构。该结构由亚波长狭缝和周期性沟槽组成，在632.8 nm波长下，可实现远场的高方向性辐射。文中用有限元法分析了狭缝宽度、沟槽深度和沟槽周期对出射光高方向辐射特性的影响，并据此优化得到了器件的结构参数。使用搭建的光学远场测试平台对该缝-槽结构进行测试发现，结构的远场发散角约为4.1°，测量结果与仿真结果基本吻合，进一步证实结构的远场高方向性辐射特性。
본문설계료일충기우은-려-은복합막층결구적금속아파장봉-조결구。해결구유아파장협봉화주기성구조조성，재632.8 nm파장하，가실현원장적고방향성복사。문중용유한원법분석료협봉관도、구조심도화구조주기대출사광고방향복사특성적영향，병거차우화득도료기건적결구삼수。사용탑건적광학원장측시평태대해봉-조결구진행측시발현，결구적원장발산각약위4.1°，측량결과여방진결과기본문합，진일보증실결구적원장고방향성복사특성。
A subwavelength structure based on Ag/Al/Ag multilayer, consisting of a narrow slit and periodically patterned metallic grooves, with property of high directional radiation, is proposed and an experimental platform used for direct optical far-field measurement is designed and built. In the simulation, we analyzed the influence of beaming effect on structure parameters, and optimized the values by finite element method. The results show that the structure can radiate light with narrow divergence angle in far field by 632.8 nm TM light. Moreover, we performed experiments to test the far-field radiation performances of the slit-grooves sample. The results illustrate that the far-field divergence angle of the structure is about 4.1°, which is in good accordance with simulation results.