High performance particle detectors are needed for the fundamental research in the high energy physics in exploring for Higgs-boson, dark matter, anti-matter, gravitational wave, and proof of the standard model, which will extend the understanding of our Universe. Future particle detectors should have ultrahigh radiation hardness, low power consumption, high spatial resolution and fast signal response. Unfortunately, some of these properties are counter-influencing for the conventional silicon drift detectors (SDDs), so that they cannot be optimized simultaneously. In this letter, the main issues of conventional SDDs have been analyzed, and a novel core-shell detector design based on micro-& nano-structures etched into Si-wafers is proposed, which is expected to reach ultrahigh radiation hardness, low power consumption, fast signal response and high spatial resolution down to sub-µm range simultaneously, which will probably meet the requirements for the most powerful particle accelerators in the near future. A prototype core-shell detector was fabricated using modern silicon nanotechnology and the functionality tested by EBIC measurement. Such high performance detector will open many new applications in extreme radiation environments such as the high energy physics, astrophysics, high resolution (bio-) imaging and crystallography, which will push these fields beyond current boundaries.