Lenze GKR05-2N 項目組在氟化鈣基板上制備了1微米厚的GSST層，并通過將GSST層蝕刻成各種不同形狀的結(jié)構(gòu)特征，創(chuàng)建了超表面。
根據(jù)該理論，當GSST處于非晶狀態(tài)時，一組表面結(jié)構(gòu)將與入射光相互作用，而當GSST相變?yōu)榫w狀態(tài)時，其它表面結(jié)構(gòu)與入射光相互作用，從而改變材料的宏觀光學(xué)特性。
不同表面結(jié)構(gòu)對入射光的相互作用不同
（圖片來源：麻省理工學(xué)院）
麻省理工學(xué)院材料研究實驗室的TianGu說：“構(gòu)建可在不同特性之間切換的超表面是一個復(fù)雜的過程，并且需要精心設(shè)計使用的形狀和圖案。通過掌握材料相變的光學(xué)特性，我們可以設(shè)計一種特定的圖案，使超透鏡在非晶態(tài)時聚焦在某點，而在相變?yōu)榫B(tài)后聚焦另一點。”
項目研究人員在使用紅外激光光源發(fā)出的光和圖案化目標物體進行的試驗中，在加熱引起相變之前，利用超透鏡對一個目標物體生成了清晰的圖像。而在加熱引起材料相變之后，這個超透鏡對另一個距離更遠的目標物體生成了同樣清晰的圖像。這無需光學(xué)元件的任何機械運動，就可實現(xiàn)兩種不同距離的物體成像。
對于這個用于概念驗證的超透鏡，研究人員利用熔爐退火引發(fā)了相變效應(yīng)。該研究團隊認識到，對于未來商業(yè)化應(yīng)用的相同原理光學(xué)元件，將需要某種形式的電子開關(guān)。
根據(jù)麻省理工學(xué)院的研究，這可以通過使用集成微加熱器以短毫秒脈沖加熱材料來實現(xiàn)，同樣的方法也可創(chuàng)建其它中間相態(tài)，從而實現(xiàn)連續(xù)焦距調(diào)整。
MikhailShalaginov說：“這就像做牛排：從生牛排開始，可以做全熟的，也可以做三分熟的，或者介于其間的任意成熟度。在未來，這個獨特的平臺將幫助我們?nèi)我饪刂瞥哥R的焦距。”
Lenze GKR05-2N
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