光学学报
光學學報
광학학보
ACTA OPTICA SINICA
2009年
10期
2898-2904
,共7页
陈淑文%朱桂新%于天宝%廖清华%刘念华%黄永箴
陳淑文%硃桂新%于天寶%廖清華%劉唸華%黃永箴
진숙문%주계신%우천보%료청화%류념화%황영잠
光学器件%光子晶体波导%定向耦合器%光分束器%能量均分
光學器件%光子晶體波導%定嚮耦閤器%光分束器%能量均分
광학기건%광자정체파도%정향우합기%광분속기%능량균분
optical devices%photonic crystal waveguides%directional coupler%beam-splitter%equipartition of energy
将五光子晶体单模波导平行、邻近放置构成定向耦合器,依据自映像原理,数值分析了输入光场对称入射时,该系统中光的传播行为.基于此结构,设计了1×3光分束器,其器件长度可短至14.26μm.仅仅通过对称地改变耦合区中两个介质柱的有效折射率,使光场在横向发生重新分布,便可实现输出能量的均分或自由分配.通过非对称地改变耦合区中的一个介质柱,可实现3个输出端的输出能量的自由分配.该光分束器具有微小尺寸和各输出端输出能量的比例可自由调制的特点,在未来集成光回路中具有广泛的应用价值.
將五光子晶體單模波導平行、鄰近放置構成定嚮耦閤器,依據自映像原理,數值分析瞭輸入光場對稱入射時,該繫統中光的傳播行為.基于此結構,設計瞭1×3光分束器,其器件長度可短至14.26μm.僅僅通過對稱地改變耦閤區中兩箇介質柱的有效摺射率,使光場在橫嚮髮生重新分佈,便可實現輸齣能量的均分或自由分配.通過非對稱地改變耦閤區中的一箇介質柱,可實現3箇輸齣耑的輸齣能量的自由分配.該光分束器具有微小呎吋和各輸齣耑輸齣能量的比例可自由調製的特點,在未來集成光迴路中具有廣汎的應用價值.
장오광자정체단모파도평행、린근방치구성정향우합기,의거자영상원리,수치분석료수입광장대칭입사시,해계통중광적전파행위.기우차결구,설계료1×3광분속기,기기건장도가단지14.26μm.부부통과대칭지개변우합구중량개개질주적유효절사솔,사광장재횡향발생중신분포,편가실현수출능량적균분혹자유분배.통과비대칭지개변우합구중적일개개질주,가실현3개수출단적수출능량적자유분배.해광분속기구유미소척촌화각수출단수출능량적비례가자유조제적특점,재미래집성광회로중구유엄범적응용개치.
Directional coupler can be constructed by parallelly putting five photonic crystal waveguides together. The propagation of the optical field entering this system symmetrically is analyzed numerically on the basis of self-imaging principle. 1×3 beam splitter, whose length can be as short as 14. 26 μm, is designed by using this structure. By symmetrically tuning the effective refractive index of two dielectric rods in the coupler, and accordingly inducing the redistribution of the electric field, equipartition or free distribution of output energy can be achieved. By asymmetrically tuning the effective refractive index of one dielectric rod in the coupler, free distribution of output energy can also be achieved. Due to the ultracompact size and the free modulation of output energy, the device has extensive practical value in future photonic integrated circuits.