Title :
High-density near-field optical recording with a solid immersion lens, conventional actuator, and a robust air gap servo
Author :
Zijp, Ferry ; Van der Mark, Martin ; Verschuren, Coen ; Lee, Julian ; Van den Eerenbeemd, Jack ; Urbach, Paul ; Van Der AA, Michael
Author_Institution :
Philips Res. Labs., Eindhoven, Netherlands
Abstract :
We present a near-field optical recording system with a solid immersion lens (SIL) in a conventional biaxial actuator. We manufactured a super-hemispherical aplanatic SIL with a numerical aperture (NA) of NA = 1.9. Our system utilizes a gap error signal (GES) and a digital servo system to drive a conventional actuator in order to maintain a constant air gap of 25 nm between the SIL and a spinning optical disc.
Keywords :
actuators; air gaps; lenses; optical disc storage; servomotors; air gap servo; biaxial actuator; conventional actuator; digital servo system; gap error signal; high-density near-field optical recording; near-field optics; numerical aperture; solid immersion lens; spinning optical disc; super-hemispherical aplanatic SIL; Actuators; Apertures; Drives; Lenses; Manufacturing; Optical recording; Robustness; Servomechanisms; Solids; Spinning; Air gap servo; near-field optics; optical recording; solid immersion lens (SIL);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.842030
