Apparatus for processing electromagnetic wave energy |
|||||||
| 申请号 | US44031774 | 申请日 | 1974-02-07 | 公开(公告)号 | US3895324A | 公开(公告)日 | 1975-07-15 |
| 申请人 | MASSACHUSETTS INST TECHNOLOGY; | 发明人 | MORGENTHALER FREDERIC R; | ||||
| 摘要 | A device for processing electromagnetic wave energy by converting the wave energy to spin waves and/or elastic waves, the present disclosure being particularly directed to the concept of providing a device made up of a single-crystal material which contains non-uniform material parameters to give graded values of material saturation 4 pi Ms. The material discussed in greatest detail is YIG and the non-uniform material parameters are furnished by doping the YIG with gallium. The graded material parameters in combination with an external magnetic bias field H result in an internal magnetic bias field H. The electromagnetic energy as it enters the material is acted upon in a manner that is influenced greatly by the contour of H. The contour of H in the present disclosure, in turn, is predetermined to present gradations in H which will allow the conversion mentioned and which allow predetermination of the wavenumber k of the magnons and/or phonons thereby formed. Furthermore, the place or space within the crystal at which conversion occurs can be somewhat determined by the profile of H thereby provided. | ||||||
| 权利要求 | 1. Apparatus for processing electromagnetic wave energy, that comprises, a magnetic material adapted to receive the electromagnetic wave energy, the material being one that will support propagating spin wave energy and propagating elastic wave energy and allow interchange of energy therebetween, the material being one in which the electromagnetic wave energy can be converted to propagating spin wave energy and propagating elastic wave energy, the material being further adapted to receive an applied magnetic field which in combination with the susceptibility of the material provides a graded internal magnetic bias field to effect spatial conversion from electromagnetic wave energy to either propagating spin wave energy or propagating elastic wave energy, the material being treated to provide a predetermined grading of said susceptibility thereby to present a predetermined profile of internal magnetic bias field to the wave energy, means for introducing said applied magnetic field to the material, input means for introducing electromagnetic wave energy to the material, and means for removing electromagnetic wave energy from the material. 2. Apparatus as claimed in claim 1 that further includes means for determining a level of applied magnetic field required to effect said conversion and means for adjusting the level of the applied magnetic field. |
||||||
| 说明书全文 | |||||||
QQ群二维码
意见反馈
意见反馈