Dynamical range and stability enhancement in electrically fused microknot optical resonators

Abstract

Microknot resonators (MKRs), locally fused using a two-probe technique, have exhibited significantly improved optical performance and mechanical stability. They have been operated with low losses both in situ and as transferred devices. We found consistently more than threefold dynamical range enhancement, which remained stable in time, in electrically fused MKRs. These devices can be harbored in next-generation optical sensors, actuators, and optomechanical applications incorporating MKR-assisted microstructures taking advantage of this simple and robust fusing technique.

Fused Microknot Optical Resonators in Folded Photonic Tapers for in-Liquid Durable Sensing

“…The first version of the in-liquid optical sensor is based on fused optical microknot resonators defined locally by manual preparation on optical fiber tapers. Tapers of high uniformity (5–30 mm in length, 3–7 m in waist diameter) were produced on the basis of single-mode low-loss fused silica fibers (single-mode fiber, SMF; wavelengths of operation 1.5–1.6 m) using an AFL Lazermaster LZM-100 splicing system [ 25 , 26 ]. OMFs were produced manually by winding an optical fiber into a knot, followed by pulling to minimum diameters (ranging 0.5–1 mm).…”

“…OMFs were produced manually by winding an optical fiber into a knot, followed by pulling to minimum diameters (ranging 0.5–1 mm). The OMF thus obtained was coupled to a wideband infrared (IR) laser and subjected to local electrical fusing following the procedure described previously [ 26 ]. An illustration of the experiment is shown in Figure 1 .…”

“…Thus, the simplicity of OMFs as sensors based on photonic transmission is typically accompanied by degraded performance as well as mechanical fragility. The sustainability of OMFs can be significantly enhanced [ 26 ] based on fusing manually-prepared OMFs around a desirable knot diameter, either by electrical [ 27 , 28 ] or other [ 29 , 30 , 31 ] techniques.…”

Quantum temporal optics

“…[1][2][3][4][5][6][7][8][9][10] This include the temporal structure of ultrafast rogue waves [13][14][15][16] some properties of fiber devices. [17][18][19][20][21][22] These systems are also benefitual to measure bio samples with high temporal resolution, [23][24][25][26][27][28][29][30] and the dynamics of nano-structures. [31][32][33][34][35][36][37] We developed a temporal SU(1,1) interferometer, by combining two time-lenses in seriel.…”

Complex Fiber Micro-Knots

“…Fiber micro-knots were suggested more than a decade ago [ 2 ] and have drawn much attention due to their simplicity, low price, and compact size [ 1 ]. Fiber micro-knots are sensitive to external conditions such as temperature, motion, or any change in refraction index [ 3 ], so they have been implemented in a variety of sensors [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”