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西安交通大學(xué)張彥鵬教授團(tuán)隊(duì)聯(lián)合俄羅斯科學(xué)院的Yaroslav V. Kartashov教授--在光子石墨烯中發(fā)現(xiàn)邊界態(tài)孤子
      邊界態(tài)出現(xiàn)在科學(xué)的各個(gè)領(lǐng)域,為未來(lái)電子或光電設(shè)備,以及聲學(xué)和光子學(xué)中的聲光傳播控制提供了潛在的機(jī)會(huì)。以前關(guān)于光子學(xué)中邊界態(tài)的實(shí)驗(yàn)主要在線性狀態(tài)下進(jìn)行,但目前的研究重點(diǎn)是將非線性效應(yīng)引入到邊界態(tài)物理學(xué)中,進(jìn)而形成邊緣孤子,光學(xué)隔離,使得在這種狀態(tài)下穩(wěn)定發(fā)射激光。這里,研究人員通過(guò)原子相干效應(yīng)和三光干涉技術(shù)在熱原子介質(zhì)中誘導(dǎo)出光子石墨烯,而后在重構(gòu)光子石墨烯晶格中鋸齒形邊緣處發(fā)現(xiàn)了邊界態(tài)孤子。為了獲得邊界態(tài)孤子,還引入拉曼增益來(lái)抵消邊界態(tài)光波傳播過(guò)程中的損耗。該研究結(jié)果可能會(huì)為未來(lái)探索非線性拓?fù)涔庾訉W(xué)開(kāi)辟了道路。
 
Figure 1. 原子能級(jí),線性帶隙結(jié)構(gòu)和邊界態(tài)。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
 
Figure 2. 實(shí)驗(yàn)證實(shí)了鋸齒形邊緣處的邊界態(tài)。
 

Figure 3. 邊緣準(zhǔn)孤子的數(shù)值模擬實(shí)驗(yàn)。

 
Figure 4. 非線性邊界態(tài)的聚焦,散焦和無(wú)衍射傳播。
 

Figure 5. 拉曼增益存在下形成邊界態(tài)孤子。
 
     該研究工作由西安交通大學(xué)張彥鵬教授團(tuán)隊(duì)聯(lián)合俄羅斯科學(xué)院的Yaroslav V. Kartashov教授于2020年發(fā)表在Nature Communications國(guó)際權(quán)威期刊上。原文:Observation of edge solitons in photonic graphene
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