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\section{Gold Free synthesis}  Despite the advancement of Au catalyzed synthesis of GaAs NW, Au free synthesis techniques are being investigated. Studies reveal that Au incorporation leads to scattering centers that disrupt desirable optical properties, and the Au catalyst itself is too expensive for industry scale up of synthesis, therefore a Au free synthesis would resolve these issues \cite{1966} !!!OTHER CITATION NEEDED. \cite{1966}.  The Techniques range from "Ga-assisted growth", selective area epitaxy (SAE), solution based growth, and oxied assisted growth.\cite{Chatillon_1995}\cite{Yu_2003}\cite{Shi_2001} Oxide assisted growth works similarly to VLS but instead of an Au catalyst, and oxide species in conjunction with laser ablation is necessary to catalyze NW growth. Growth is maintained in the same direction as VLS\cite{Duan_2000} GaAs NW growth via this method has been reported, with the oxide species being $Ga_{2}O_{3}$.\cite{Shi_2001} A quartz tube containing a Si surface is mounted in a high-temperature tube furnace containing 25\% gallium oxide and 75\% GaAs powde. The tube is evacuated, heated to $930^{\circ}C$, then a laser ablation (10 Hz, 400 mJ/pulse, \lambda = 248nm) takes place for 5h. Nanowires with 10-120nm diameters resulted.