CAJ | 학술논문

采用严格耦合波方法研究了普通棱镜耦合的表面波传感器与光栅辅助的表面波传感器的传感特性.设计了工作在1550 nm处的一维光子晶体与光栅的材料参数与结构参数.光栅的深度为20 nm,周期为524.6 nm,占空比为0.5.模拟计算表明,光栅的引入导致双共振峰的出现,表面波的模式出现分裂.当外界折射率变化时,两个共振峰向相反的方向移动.利用双共振峰的这种特性进行传感,可以使光栅辅助表面波传感器的角度灵敏度提高到普通棱镜结构表面波传感器的3倍以上.
채용엄격우합파방법연구료보통릉경우합적표면파전감기여광책보조적표면파전감기적전감특성.설계료공작재1550 nm처적일유광자정체여광책적재료삼수여결구삼수.광책적심도위20 nm,주기위524.6 nm,점공비위0.5.모의계산표명,광책적인입도치쌍공진봉적출현,표면파적모식출현분렬.당외계절사솔변화시,량개공진봉향상반적방향이동.이용쌍공진봉적저충특성진행전감,가이사광책보조표면파전감기적각도령민도제고도보통릉경결구표면파전감기적3배이상.
An ordinary prism coupling surface waves (SW) sensor and grating-assisted SW sensors are studied using rigorous coupled-wave-analysis method. The material parameters and structural parameters of the one-dimensional photonic crystal and grating are designed, which works under 1550 nm. The depth of grating is 20 nm, the pitch is 524.6 nm, and the duty cycle is 0.5. Simulation shows that grating leads to the emergence of dual-resonance dip, and the surface mode is splitted. The use of double resonance dip characteristics can improve sensitivity of the perspective of an ordinary prism structure SW sensor more than 3 times.