CAJ | 학술논문

提出一种含CaF2缺陷层的一维光子晶体结构，可用于光通信波段的可调谐滤波。通过传输矩阵理论对滤波器透射特性进行分析，结果表明：随着周期数目的增加，光子晶体禁带截止度增强，缺陷模半高宽逐渐变窄，同时缺陷层厚度增加使缺陷峰的位置均匀红移；正入射时，所设计滤波器结构的光子禁带范围是1170～2150 nm ；当入射角增大至掠入射过程中，T E模式全角度光子禁带为1170～2035 nm ，T M 模式全角度光子禁带为1170～1640 nm ，表明T M 模式禁带对入射角度的变化较敏感。研究发现，选取较大的入射角度或增加光子晶体周期数可以使 TM ，TE模式透射峰完全分离，通过角度调谐方式可实现光通信S波段两种模式的滤波。该光子晶体滤波器具有高透射率，窄半高宽，宽调谐范围的滤波特性，可有效提高传统滤波器的滤波性能。
제출일충함CaF2결함층적일유광자정체결구，가용우광통신파단적가조해려파。통과전수구진이론대려파기투사특성진행분석，결과표명：수착주기수목적증가，광자정체금대절지도증강，결함모반고관축점변착，동시결함층후도증가사결함봉적위치균균홍이；정입사시，소설계려파기결구적광자금대범위시1170～2150 nm ；당입사각증대지략입사과정중，T E모식전각도광자금대위1170～2035 nm ，T M 모식전각도광자금대위1170～1640 nm ，표명T M 모식금대대입사각도적변화교민감。연구발현，선취교대적입사각도혹증가광자정체주기수가이사 TM ，TE모식투사봉완전분리，통과각도조해방식가실현광통신S파단량충모식적려파。해광자정체려파기구유고투사솔，착반고관，관조해범위적려파특성，가유효제고전통려파기적려파성능。
A one‐dimensional photonic crystal filter with calcium fluoride defect layer is pro‐posed for optical communication .The transmission characteristics of the filter are analyzed on the basis of transfer matrix theory and the results suggest :with the increase of the period number of photonic crystal ,the rejection rate of the band gap is increased and the FWHM of defect mode is gradually narrowing ;the position of the defect peak gets red shifted uniformly with the augment of defect layer thickness .At normal incidence ,the photonic band gap of the designed filter struc‐ture ranges from 1 170 nm to 2 150 nm ;as the incident angle increases to grazing incidence ,the omnidirectional photonic band gap ranges from 1 170 nm to 2 035 nm for TE mode and 1 170 nm to 1 640 nm for T M mode ,w hich show s that the forbidden band of T M mode is more sensitive to the change of incident angle .It is also found that the transmission peak of TM and TE mode will become separate with a higher incident angle or larger period number of photonic crystal .The tun‐able filter can be realized in S band of optical communication through angle tuning .The photonic crystal filter has high transmittance ,narrow FWHM ,wide tuning range ,and can effectively im‐prove the traditional filter performance .