Study of the shape of an optical window in a super-resolution state by electromagnetic-thermal coupled simulation: Effects of melting of an active layer in an optical disc.

Autor:	Haruyuki Sano, Takayuki Shima, Masashi Kuwahara, Yoshiya Fujita, Munehisa Uchiyama, Yoshiyuki Aono
Předmět:	ELECTROMAGNETIC waves HEAT conduction OPTICAL diffraction ELECTRIC field strength OPTICAL disks
Zdroj:	Journal of Applied Physics; 2014, Vol. 115 Issue 15, p153104-1-153104-6, 6p, 2 Color Photographs, 1 Diagram, 1 Chart, 5 Graphs
Abstrakt:	We performed a multi-physics simulation for the propagation of electromagnetic waves and heat conduction in a super-resolution optical disc that includes an active layer of InSb. Because the change in the optical constant of InSb due to the phase transition is taken into account, the melting of the active layer can be realistically simulated in our calculation. It was found that in the case of an incident light power (P) of 2 mW, a profile of the electric field intensity transmitted through the InSb layer has an asymmetric shape with a narrow peak. This beam-narrowing was suggested to be an essential mechanism of the super-resolution, because a narrower light beam allows the detection of a smaller pit structure than the optical diffraction limit. This beam-narrowing was found to be originating from a small molten region produced in the InSb layer, which works as a mask for light exposure. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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