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密歇根大学和德克萨斯大学的研究人员目前已制成一台双焦点菲涅耳透镜调制器 ,并对其进行测试。该调制器采用 (Ga As/ Al Ga As)多量子阱异质结构。该结构由分子束外延产生 ,采用了 PIN(MQW)二极管的形式 ,以 6 0个周期的无掺杂 Ga As/ Al-Ga As夹于 2 0个周期的双面超晶格 Ga
Researchers at the University of Michigan and the University of Texas have now made a bifocal Fresnel lens modulator and tested it. The modulator uses a (GaAs / AlGaAs) multiple quantum well heterostructure. This structure was created by molecular beam epitaxy, using a PIN (MQW) diode in the form of a 200-cycle undoped GaAs / Al-GaAs sandwiched between 20 cycles of double-sided superlattice Ga