a競(jìng)爭(zhēng)非局域介質(zhì)中光束調(diào)控

浦紹質(zhì)++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(lǐng)域具有潛在應(yīng)用。為了獲得光束傳輸?shù)挠行Э刂品椒ǎ瑪?shù)值計(jì)算了亮孤子及亮孤子對(duì)由非局域介質(zhì)進(jìn)入競(jìng)爭(zhēng)非局域介質(zhì)后的傳輸行為。發(fā)現(xiàn)，非局域亮孤子進(jìn)入競(jìng)爭(zhēng)非局域介質(zhì)后以呼吸子的形式傳輸。非局域偶極孤子進(jìn)入競(jìng)爭(zhēng)非局域介質(zhì)后分裂成兩個(gè)獨(dú)立傳輸?shù)牧凉伦印７次幌喾蔷钟蛄凉伦咏M成的震蕩束縛態(tài)進(jìn)入競(jìng)爭(zhēng)非局域介質(zhì)后的傳輸行為與界面（非局域介質(zhì)與競(jìng)爭(zhēng)非局域介質(zhì)的交界）位置有關(guān)。當(dāng)界面選到節(jié)點(diǎn)（非局域孤子間距離取最小值的點(diǎn)）附近時(shí)，震蕩束縛態(tài)分裂成兩個(gè)獨(dú)立的孤子；界面選到其它位置時(shí)，震蕩束縛態(tài)以準(zhǔn)束縛態(tài)形式傳輸。該發(fā)現(xiàn)為光的傳輸與控制提供了新的方法。

關(guān)鍵詞：非局域介質(zhì)；空間孤子；競(jìng)爭(zhēng)非線性；光束調(diào)控；液晶

DOI：1015938/jjhust201705025

中圖分類號(hào)： O4375

文獻(xiàn)標(biāo)志碼： A

文章編號(hào)： 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(xiàng)目： 國(guó)家自然科學(xué)基金（61405049）；黑龍江省自然科學(xué)基金（QC2015086）

作者簡(jiǎn)介：

浦紹質(zhì)（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(shí)空間（時(shí)間）形狀保持不變的光脈沖。當(dāng)色散（衍射）引起的展寬效應(yīng)和自聚焦效應(yīng)抵消時(shí)光束傳輸過(guò)程中形狀保持不變即形成光孤子。迄今，發(fā)現(xiàn)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(ài)因斯坦凝聚[3]、熱非線性材料[4]等?！?br>