Continuum-Based Bridging Model of Nanoscale Thin Film Considering Surface Effects

Abstract

We report the optical design of a solid immersion mirror (SIM) incorporated with a flying slider -called a SIM slider -for a near-field recording (NFR) system, its fabrication process, and optical evaluation. To achieve diffraction-limited performance $=14 (rms), a two-step glass-molding process was employed to fabricate the SIM. The numerical aperture of the SIM slider was 1.29. The rms value of the total wavefront aberration was 0:0679. The fabricated SIM slider achieves the optical performance estimated by calculation with the fabrication errors considered, and even diffraction-limited performance. However, an rms value of 0:035-0:04 for the total wavefront aberration is generally assigned for condensing optics for practical use because not only condensing optics but also other optical elements are involved in a practical optical disc system. Therefore, the aberration caused by the fabrication errors in the molding process should be reduced to at least 59% of the present level, if the SIM is to be applied to a practical NFR system.

Surface effects on the dynamic behavior of nanosized thin film resonator

“…© 2010 American Institute of Physics. The elastic prop-erties and coefficient of thermal expansion of copper thin films have been investigated by Cho et al, 16 and we determined that a thin film can be stiffer or more flexible with respect to the surface orientation and loading direction due to surface effects. [1][2][3][4][5] For thin film structures with nanometer-range thickness dimensions, the surface-tovolume ratio is very high compared to bulk counterparts.…”

Molecular dynamics-based continuum models for the linear elasticity of nanofilms and nanowires with anisotropic surface effects

“…Cho et al [2009] suggested a sequential multiscale method in order to determine initial surface stress and surface Lamé constants using a matching method based on a molecular dynamics (MD) simulation. As an extension of this multiscale model, a finite element analysis including thermomechanical properties was carried out by Choi et al [2010a].…”

“…For this reason, solid crystal surfaces contain excess surface energy and residual surface stress. The surface stress significantly affects the equilibrium state and elastic properties of a nanostructure [Wolf 1991;Cammarata and Sieradzki 1989;Streitz et al 1994]. Streitz et al [1994] introduced a surface stress model and calculated the equilibrium biaxial strain and biaxial modulus for an axis-symmetric thin film.…”

Untitled

“…Recently, Cho et al [2009] proposed a continuum-based bridging model for a nanofilm using the surface elasticity model by Gurtin and Murdoch [1975;. Cho et al [2009] suggested a sequential multiscale method in order to determine initial surface stress and surface Lamé constants using a matching method based on a molecular dynamics (MD) simulation. As an extension of this multiscale model, a finite element analysis including thermomechanical properties was carried out by Choi et al [2010a].…”