浦紹質++馬愈++張留洋++黃金哲
摘要:非局域空間孤子具有低功率、類似粒子的彈性碰撞特性,因此在光信息處理和光連接領域具有潛在應用。為了獲得光束傳輸的有效控制方法,數值計算了亮孤子及亮孤子對由非局域介質進入競爭非局域介質后的傳輸行為。發現,非局域亮孤子進入競爭非局域介質后以呼吸子的形式傳輸。非局域偶極孤子進入競爭非局域介質后分裂成兩個獨立傳輸的亮孤子。反位相非局域亮孤子組成的震蕩束縛態進入競爭非局域介質后的傳輸行為與界面(非局域介質與競爭非局域介質的交界)位置有關。當界面選到節點(非局域孤子間距離取最小值的點)附近時,震蕩束縛態分裂成兩個獨立的孤子;界面選到其它位置時,震蕩束縛態以準束縛態形式傳輸。該發現為光的傳輸與控制提供了新的方法。
關鍵詞:非局域介質;空間孤子;競爭非線性;光束調控;液晶
DOI:1015938/jjhust201705025
中圖分類號: O4375
文獻標志碼: A
文章編號: 1007-2683(2017)05-0137-06
Beam Steering in Nonlocal Mediumwith Competing Nonlinearities
PU Shaozhi,MA Yu,ZHANG Liuyang,HUANG Jinzhe
(School of Applied Sciences, Harbin University of Science and Technology, Harbin 150080, China)
Abstract:Nonlocal spatial solitons have potential applications in alloptical signal processing and optical interconnects due to their low power and particlelike nature on interactions In order to obtain the effective method to beam steering, the propagation of bright solitons and soliton pairs from the nonlocal medium to the nonlocal medium with competing nonlinearities is investigated by the numerical simulations When propagate from nonlocal medium to the nonlocal medium with competing nonlinearities, the nonlocal bright solitons will propagate in the form of breather, the nonlocal dipole solitons will split into two individual solitons, however, the propagation of the nonlocal oscillating bound state which is composed by two outofphase solitons depends on the position of the interface (nonlocal medium and nonlocal media with competing nonlinearities interface) When the position of the interface is choose at the node (the minimum distance of the soliton pairs), the nonlocal oscillating bound state will split into two individual solitons, otherwise, and the oscillating bound state will propagate in the form of bound state These results introduce a new way to beam propagation and steering
Keywords:nonlocal medium; spatial solitons; competing nonlinearities; beam steering; liquid crystal
收稿日期: 2016-01-12
基金項目: 國家自然科學基金(61405049);黑龍江省自然科學基金(QC2015086)
作者簡介:
浦紹質(1981—),男,博士,講師,Email:shaozhipu@126com;
馬愈(1993—),男,碩士研究生;
張留洋(1981—),男,博士,副教授
0引言
非局域光孤子指在非局域材料中傳輸時空間(時間)形狀保持不變的光脈沖。當色散(衍射)引起的展寬效應和自聚焦效應抵消時光束傳輸過程中形狀保持不變即形成光孤子。迄今,發現有很多材料具有非局域非線性,如向列相液晶[1]、等離子體[2]、玻色愛因斯坦凝聚[3]、熱非線性材料[4]等。……