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医生在治疗癌症患者或患有其它基因突变引起疾病的患者过程中最大的挑战是药物一般无法区分健康细胞和危险细胞。为了解决这一问题,美国Florida州立大学的科学家在研究一种利用特殊分子的新技术,这一分子暴露于光线下时只杀死有害细胞。 相似文献
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Harmonic Millimeter Wave Generation and Frequency Up-Conversion Using Optical Injection Locking and Brillouin Selective Sideband Amplification
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Harmonic millimeter wave (mm-wave) generation and frequency up-conversion are experimentally demonstrated using optical injection locking and Brillouin selective sideband amplification (BSSA) induced by stimulated Brillouin scattering in a 10-km single-mode fiber. By using this method, we successfully generate third-harmonic mm-wave at 27 GHz (fLO = 9 GHz) with single sideband (SSB) modulation and up-convert the 2 GHz intermediate frequency signal into the mm-wave band with single mode modulation of the SSB modes. In addition, the mm-wave carrier obtains more than 23 dB power gain due to the BSSA. The transmission experiments show that the generated mm-wave and up-converted signals indicate strong immunity against the chromatic dispersion of the fibers. 相似文献
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光在均匀介质中是沿直线传播的,如果光介质的密度发生改变时,光路将随着发生改变.光线从光密介质射向光疏介质时,随着入射角的不断增大,折射角也不断地增大,并且折射光线的强度在减弱,反射光线的强度在增强如果介质的折射率为n. 相似文献
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