Abstract
We applied femtosecond laser polymerisation technique to fabricate a novel Bloch surface wave integrated photonic device with a compact coupling scheme. The device consisted of a waveguide, coupling and decoupling gratings and focusing and defocusing triangles. We manufactured an array of devices with varying geometrical parameters of waveguide. Excitation and propagation of Bloch surface wave waveguide modes were studied by direct and back focal plane imaging. The obtained results prove that the maskless and flexible femtosecond laser polymerisation technique may be applied for fabrication of Bloch-surface-wave based integrated photonics.
Highlights
Integrated photonics is a branch of optics that is dedicated to the development of miniature devices on a single chip that generate, guide, modulate and detect optical signals
We proposed a femtosecond laser polymerisation technique for nanofabrication of novel BSW-supporting photonics devices
We fixed the lateral size and the period of gratings, the size of triangles and waveguide length, while the height of the waveguide was varied in the range of 170–220 nm and the width of the waveguide was varied in the range of 1400–2000 nm
Summary
Integrated photonics is a branch of optics that is dedicated to the development of miniature devices on a single chip that generate, guide, modulate and detect optical signals. SEW-supporting optical components are intrinsically planar and compatible with well-developed lithographic techniques. The most widely-studied type of SEWs are surface plasmon polaritons (SPPs). SPPs suffer from severe shortcomings that strongly limit the performance of SPP-based devices: sensors and elements of integrated optics. SPPs propagating on a metal surface are strongly attenuated due to Ohmic losses. Plasmonic waveguide performance is always a trade-off between field confinement and propagation distance: for waveguides with high confinement, SPP propagation distances are only dozens of microns (channel plasmon–polaritons), while millimetre range propagation distances lead to a very weak confinement, much larger the incident wavelength (long-range surface plasmon–polariton waveguides) [1]. The SPP dispersion law is strictly defined by the properties of several metals
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