Efficiency Analysis of Near Field Optical Transducer Used in Heat-Assisted Magnetic Recording

Autor:	Kaidong Ye, Jianming Li, Jing Zhang, Zhanhong Cen, Yeow Teck Toh, Baoxi Xu
Rok vydání:	2013
Předmět:	Permittivity Materials science business.industry Near and far field Dissipation Polarization (waves) Electronic Optical and Magnetic Materials Transducer Optics Heat-assisted magnetic recording Electric field Electrical and Electronic Engineering Air gap (plumbing) business
Zdroj:	IEEE Transactions on Magnetics. 49:3580-3583
ISSN:	1941-0069 0018-9464
DOI:	10.1109/tmag.2012.2237164
Popis:	For heat-assisted magnetic recording system, the efficiency of the optical energy delivery system is important for its application. It affects not only the requirement to laser source output power, but also the heat-assisted magnetic recording (HAMR) head performance and reliability. In this paper, the key factor caused the low efficiency of the near field optical transducer is studied. The results show that the main reason is the longitudinal polarization of the transducer radiation. Large permittivity difference between recording layer and air gap makes large electric field intensity difference within recording layer and air gap. Due to small electric field coupling from air to recording layer, large percentage of the incident power is reflected, absorbed or scattered by other components. The investigation results for power dissipation distributions show that the largest portion of power dissipation is reflection. Reusing the reflected power will be an effective way to improve whole optical system efficiency. Simulation results show that more than 30% increase of the efficiency can be obtained by reusing the reflected power.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::67841b6749349f040738ad7f6af27ce3 https://doi.org/10.1109/tmag.2012.2237164 Zobrazit plný text záznamu