Abstract
A cornerstone in the operation of numerous detecting and sensing quantum setups is the sharp change in the response once a condition ceases to be effective; this regime is typically realized by perfectly cloaking a nanoinclusion from the propagating matter waves. Such a purpose is found well-served by optimally sized nanocylinders, embedded into a suitable quantum texture, that efficiently hide themselves from obliquely impinging electron beams. The optimal designs exhibit high selectivity for particle energies while being wideband with respect to incidence angles; these features render them deployable in various quantum devices from furtive sensors and detectors to quantum switches and matter-wave filters.