Miniaturized stereo fiber devices based on the wrapon-a-rod technology

3D micro-devices based on subwavelength-diameter microfibres (MFs) with a strong evanescent field have attracted increasing attention because of the recent rapid development of the so-called wrap-on-a-rod technology. Because they are fabricated from a single-mode fiber with low stiffness and micrometric bending radii, MFs can be wrapped multiple times on a thin microrod (hundreds of micrometers) and do not experience any input/output coupling problems. By tuning the pitch between turns and specializing the rod surface, a variety of functions can be realized and even multiple functions can be integrated on a single device, which is the concept of the future lab-on-a-microrod. Here we will show several kinds of lab-on-a-microrod devices including a resonator, grating, Hi-Bi device, and polarizer. The applications in sensing and lasing will also be discussed.