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用聚焦离子束气体辅助刻蚀在LiNbO3上制备亚微米圆孔点阵
Gas-Assisted Etching of Micro-Hole Lattice Array on Lithium Niobate with Focused Ion Beam
【摘要】 使用聚焦粒子束(FIB)在LiNbO3上刻蚀用于光子晶体的亚微米圆孔二维点阵,研究了刻蚀束流、刻蚀时间和填充率等刻蚀参数对刻蚀结果造成的影响。为获得更好的刻蚀效果,还采用了FIB的气体辅助刻蚀方法(gas-assisted etching,GAE)。研究发现,与直接刻蚀结果相比,GAE减小了反沉积效应,得到了更好的孔形。禁带模拟计算表明,与常规FIB刻蚀出的锥形圆孔相比,使用XeF2气体辅助刻蚀得到的这种侧壁更陡直的圆孔阵列构成的光子晶体禁带更趋近于理想光子晶体的禁带。
【Abstract】 Two-dimensional micro-hole lattice arrays with specified structure parameters were fabricated on LiNbO3(LN) substrate by means of focused ion beam(FIB) etching,and the influence of etching parameters,such as spot current,etching time full rate,were investaged.In order to etch good quality holes,the authors used gas-assisted etching(GAE) with focused ion beam.The results show that GAE can reduce the effect of redeposition and obtain better hole profile compared with FIB etching.According to simulative calculation,the photonic bandgap of lattice array,etched by GAE with XeF2,is more close to the ideal photonic bandgap.
- 【文献出处】 北京大学学报(自然科学版) ,Acta Scientiarum Naturalium Universitatis Pekinensis , 编辑部邮箱 ,2009年06期
- 【分类号】O614.111
- 【被引频次】3
- 【下载频次】286