Taminiau Tim H, Moerland Robert J, Segerink Frans B, Kuipers Laurens, van Hulst Niek F
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860, Castelldefels (Barcelona), Spain.
Nano Lett. 2007 Jan;7(1):28-33. doi: 10.1021/nl061726h.
We present a resonant optical nanoantenna positioned at the end of a metal-coated glass fiber near-field probe. Antenna resonances, excitation conditions, and field localization are directly probed in the near field by single fluorescent molecules and compared to finite integration technique simulations. It is shown that the antenna is equivalent to its radio frequency analogue, the monopole antenna. For the right antenna length and local excitation conditions, antenna resonances occur that lead to an enhanced localized field near the antenna apex. Direct mapping of this field with single fluorescent molecules reveals a spatial localization of 25 nm, demonstrating the importance of such antennas for nanometer resolution optical microscopy.
我们展示了一种位于金属包覆玻璃纤维近场探头末端的共振光学纳米天线。通过单个荧光分子在近场中直接探测天线共振、激发条件和场局域化，并与有限积分技术模拟结果进行比较。结果表明，该天线等同于其射频类似物——单极天线。对于合适的天线长度和局部激发条件，会出现天线共振，从而导致天线顶点附近的局域场增强。用单个荧光分子对该场进行直接映射揭示了25纳米的空间局域化，证明了此类天线对于纳米分辨率光学显微镜的重要性。
