We investigated the simultaneous excitation of localized surface plasmons (LSPs) and propagating surface plasmons (PSPs) on a thin metallic film with an array of nanoholes for the enhancement of fluorescence intensity in heterogeneous bioassays. Experiments supported by simulations reveal that the co-excitation of PSP and LSP modes on the nanohole array in a Kretschmann configuration allows for fluorescence enhancement of about 10(2) as compared to a flat Au surface irradiated off-resonance. Moreover, this fluorescence signal was about 3-fold higher on the substrate supporting both PSPs and LSPs than that on a flat surface where only PSPs were resonantly excited. Simulations also indicated the highly directional fluorescence emission as well as the high fluorescence collection efficiency on the nanohole array substrate. Our contribution attempts to de-convolute the origin of this enhancement and identify further ways to maximize the efficiency of surface plasmon-enhanced fluorescence spectroscopy for implementation in ultra-sensitive bioassays.
Computer keyboards are often used to transmit confidential data such as passwords. The sensitive information such as keystrokes could be recovered by using the electromagnetic (EM) waves from the electronic components of the keyboard. In this paper, we have investigated the information leakage on the ground line of the PS/2 serial cable due to crosstalk and radiative coupling. The coupling principles are analyzed firstly. And then, through the experiments we found that the signals of keystrokes could leak to the ground line network which could then be detected on the other power outlets whose share the same electric line. Lastly, the eavesdropping experiments demonstrated that the keystrokes could be reproduced on the other places of the ground line network with no trace.
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