We study precision electroweak constraints within a RS1 model with gauge fields and fermions in the bulk. The electroweak gauge symmetry is enhanced to SU(2) L × SU(2) R × U(1) B−L , thereby providing a custodial isospin symmetry sufficient to suppress excessive contributions to the T parameter. We then construct complete models, complying with all electroweak constraints, for solving the hierarchy problem, without supersymmetry or large hierarchies in the fundamental couplings. Using the AdS/CFT correspondence our models can be interpreted as dual to a strongly coupled conformal Higgs sector with global custodial isospin symmetry, gauge and fermionic matter being fundamental fields external to the CFT. This scenario has interesting collider signals, distinct from other RS models in the literature.

For high numerical aperture (NA) near-field systems using a solid immersion lens, layer stack types of first-surface read-only-memory (ROM) discs have been investigated. Complicated interactions of high-NA incident and diffracted waves with surface waves occur in multilayer-stacked subwavelength structures on the discs. Therefore, vector diffraction simulation in consideration of these effects is indispensable for the optimization of the disc structures. We used rigorous coupled wave analysis to numerically calculate readout signals from the discs. On the basis of the simulation results, we actually fabricated high-density ROM media. Consequently, a significantly low jitter of 6.8% was obtained for 100 Gbyte ROM media with a designed structure in an NA 2.0 system.

In this paper, we describe a new physical construction method to assign preformatted information on the guide layer of a super-multilayer disc. A minimum unit of the physical construction consists of “basic mark” and “center track mark”. The basic mark consists of plural wobbled grooves and the center track mark is introduced to identify the center track of the basic mark. We designed a new physical format of the guide layer allocating those marks and experimentally confirmed the bit error rate below 1×10-4 and the defocus margin around 3 µm, which satisfy requirements for realizing an optical disc system.

We studied a high-numerical-aperture (NA) solid immersion lens (SIL) system using tin alloy nitride write-once recording media with a protective cover layer. The jitter value of the disk that was recorded by this system was 8.5% at 100 GB capacity with a track pitch of 160 nm and a bit length of 56.25 nm. We confirmed the feasibility of the SIL-R disk using these recording media with the high-density recording SIL system.

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