Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Kristopher S. Urquhart"'
Publikováno v:
Applied optics. 33(17)
The optimum design of free-space optical interconnection systems utilizing diffractive optics is determined from a practical engineering standpoint for systems ranging from space invariant to fully space variant. System volume is calculated in terms
Autor:
Ashok V. Krishnamoorthy, Kristopher S. Urquhart, Sadik C. Esener, Philippe J. Marchand, Pierre Ambs, Sing H. Lee
Publikováno v:
Applied optics. 32(2)
The design, analysis, and feasibility of a novel motionless-head parallel readout optical-disk system are presented. The system is designed to read data blocks distributed radially on the disk’s active surface, and it has the unique advantage that
Publikováno v:
Optics letters. 18(4)
An e-beam lithographic technique is described that produces multiple discrete phase levels as a surface-relief structure directly in positive e-beam resist. Processing techniques are presented for two positive e-beam resists: EBR-9 and polymethyl met
Autor:
Kristopher S. Urquhart, J. Michael Larsson, Sing H. Lee, Bernard Kress, Walter Daeschner, David Zaleta, Jiao Fan
Publikováno v:
SPIE Proceedings.
Due to the stringent requirements on the lateral alignment and the large number of steps required to fabricate diffractive optics by typical microlithographic techniques, the need for more efficient methods to fabricate these elements has arisen. Thi
Autor:
Philippe J. Marchand, Pierre Ambs, Ashok V. Krishnamoorthy, Sadik C. Esener, Kristopher S. Urquhart, Sing H. Lee
Publikováno v:
SPIE Proceedings.
A motionless head 2-D parallel readout system for optical disks is presented. The system is designed to read data blocks encoded as 1-D Fourier holograms distributed radially on the disk active surface. Such systems offer several advantages: high dat
Autor:
Sing H. Lee, Kristopher S. Urquhart
Publikováno v:
SPIE Proceedings.
A numerical encoding method for digital holography is described. The method directly encodes both the amplitude and phase of a complex number using pure phase transmission. Fabrication techniques are discussed and experimental results are presented t
Publikováno v:
SPIE Proceedings.
A single hybrid refractive/diffractive lens element is designed to replace the multiple refractive cylindrical lenses present in the parallel readout optical disk system. The new system has less elements, simplified alignment, and significantly reduc
Publikováno v:
Optical Society of America Annual Meeting.
Free-space optical interconnects can be used to provide communication between sources and detectors (in the same or different planes) in a digital optical processor. Diffractive optics are particularly well suited to perform this interconnection beca
Publikováno v:
SPIE Proceedings.
The curved fringes that exist in spherical diffractive lenses present problems in terms of the computational cost of fracturing the curved fringes into e-beam acceptable shapes, and the fact that the resulting minimum fringe width is limited to sever
Publikováno v:
Applied Optics. 34:2522
One of the general requirements of a computer-aided design system is the existence of efficient (in data size and running time) algorithms that are generally reliable for the broadest range of design instances. The restricted data formats of the elec