Typically, conventional micro-nano fabrication methods are applied to flat surfaces, ensuring precise alignment and resolution at the nanoscale. Nevertheless, when dealing with curved or multi-oriented substrates, the task becomes considerably more intricate, necessitating complex equipment for sample positioning, lithographic alignment, and focusing. This often results in significantly reduced fabrication capabilities compared to standard processes. Recently, our group introduced a straight method to handle micro-structures fabricated by two photon lithography and conformably place them on curved surface target objects by exploiting Van der Walls adhesion of ultra-thin polymeric film used as temporary freestanding support. In this invited lecture, we will review the most recent results of our group with this approach applied to the field of optical meta-surfaces and sensors, highlighting the future directions and the possible extension of the technology to other fields.
The continuously increasing interest in flexible and integrated photonics requires new strategies for device manufacturing on arbitrary complex surfaces and with lowest possible size, respectively. Terahertz (THz) technology can particularly benefit from this approach to implement compact systems for generation, detection and on-demand manipulation of THz radiation. Here we present a novel fabrication method to realize conformable metasurfaces. The flexible and versatile character of polymeric nanomembranes is combined with direct laser writing via two-photon polymerization and metal deposition to develop freestanding ultra-thin quasi-perfect plasmonic absorbers with an unprecedentedly high level of conformability. Moreover, revealing new flexible dielectric materials presenting low absorption and permittivity in the THz range, this work paves the way for the realization of ultra-thin, conformable hybrid or all-dielectric devices enhancing the application of THz technologies, and flexible/integrated photonics in general.
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