When remains the DC power, the decreasing of gas pressure can lead to the increasing of etching rate and the transformation from isotropic etching to anisotropic etching.
在直流功率一定时，工作气压的降低会导致刻蚀速率的增加，并且刻蚀由各向同性转变为各向异性。
If the RF power, pressure are continued to increase, the etching rate decrease.
再继续增加射频功率、压力，刻蚀速率反而会下降。
Therefore, plasma etching anisotropy can be improved by increasing rf frequency or rf-bias power.
因此，等离子体刻蚀的各向异性可以通过增加射频频率和射频功率来改善。
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