Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Experimental Study on the Operation of a Keyhole-Shaped Lens in a Microcolumn

  • Received : 2011.09.23
  • Accepted : 2011.12.05
  • Published : 2011.12.25
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Abstract

An advanced microcolumn is proposed which adopts a modified einzel lens structure. The newly designed einzel lens is composed of four electrodes. The two center electrodes are specially designed electrostatic quadrupole (EQ) einzel lenses having keyhole instead of circular apertures. We constructed the advanced microcolumn with the EQ-einzel lenses, and operated the newly designed microcolumn in single lens mode and double-lens mode. The preliminary results show that the EQ-einzel lens can improve the performance of the micro-column for large sample applications.

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References

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