Applications of Photonic Crystals with Degenerate Spectral Band Edge
- 技术应用
- This invention could significantly benefit the design of ultrasensitive optical switches, quantum all-optical data storage and data processing devices. Ultraslow light can also be used for quantum communication and design of novel acousto-optical devices.
- 详细技术说明
- University researchers have developed a photonic crystal with specially designed geometry and composition capable of slowing down electromagnetic pulses, thereby enhancing the physical characteristics of non-linear and other active electromagnetic materials, as well as enhancing and reducing sizes of various electromagnetic devices.
- *Abstract
-
In a vacuum, light propagates with a constant velocity, while in an optically transparent non-dispersive media, the speed of light propagation can be different. At optical frequencies, the refractive index of transparent materials usually does not exceed several units, and the speed of light propagation is of the same order of magnitude as the speed of light in vacuum.
The situation can change dramatically in strongly dispersive media. Although the phase velocity of light is still determined by the same mathematical expression, the speed of electromagnetic pulse propagation is now different and is determined by the group velocity which is one of the most important electromagnetic characteristics of the medium. With certain reservations, the group velocity coincides with the electromagnetic energy velocity and is usually referred to simply as the propagation speed of light in the medium.
Strong dispersion means that the group velocity strongly depends on the frequency. In the slow light case, the electromagnetic pulse propagates through the dispersive medium at a speed, regardless of the respective value of the phase velocity. In some cases, it can even turn virtually to zero, which implies that the electromagnetic wave at the respective frequency does not transfer the energy.
Slow and ultraslow light can have numerous and diverse practical applications. These phenomena can be associated with dramatic enhancement of nonlinear effects (higher harmonic generation, wave mixing, etc.), magnetic Faraday rotation, and many other important electromagnetic properties of the light-conducting medium. Such an enhancement can facilitate design of controllable optical delay lines, phase shifters, miniature and efficient optical amplifiers and lasers, etc. In addition, ultraslow light might allow nonlinear interactions down to a single photon level.
- *IP Issue Date
- Feb 1, 2011
- *Principal Investigation
-
Name: Aleksandr Figotin
Department:
Name: Ilya Vitebskiy
Department:
- 附加资料
- Patent Number: US7881570B2
Application Number: US2007720592A
Inventor: Figotin, Aleksandr | Vitebskiy, Ilya M.
Priority Date: 28 Jan 2005
Priority Number: US7881570B2
Application Date: 31 May 2007
Publication Date: 1 Feb 2011
IPC Current: G02B000634 | G02B000610
US Class: 385037 | 385129
Assignee Applicant: The Regents of the University of California
Title: Photonic devices having degenerate spectral band edges and methods of using the same
Usefulness: Photonic devices having degenerate spectral band edges and methods of using the same
Summary: For manipulating electromagnetic energy, such as light and microwave pulses for optical a microwave application.
Novelty: Photonic device for manipulating electromagnetic energy, has periodic waveguide structure with electromagnetic dispersion relation that exhibits frequency gap with degenerate band edge for input electromagnetic wave
- 主要类别
- 光学
- 细分类别
- 光学元件
- 申请号码
- 7881570
- 其他
-
Tech ID/UC Case
18821/2005-400-0
Related Cases
2005-400-0
- 国家/地区
- 美国
