A tailored 100%-efficient 532/1064-nm demultiplexer in y-cut LiNbO₃ crystal

Abstract

In this Letter, we report a tailored 532/1064-nm demultiplexer based on a multimode interference (MMI) coupler with an efficiency of 100%. The device structure is designed according to the self-imaging principle, and the propagation and the wavelength division performance are simulated by the beam propagation method. The demultiplexer is fabricated in a y-cut LiNbO3 crystal by femtosecond laser direct writing (FLDW) combined with the ion implantation technique. The end-face coupling system is used to measure the near field intensity distribution, and the spectra collected from the output ports are obtained by spectrometers. The simulated and the experimental results indicate that the customized demultiplexer in the LiNbO3 crystal presents excellent wavelength division performance operating at 532 nm and 1064 nm. This work demonstrates the application potential of FLDW technology for developing miniaturized photonic components and provides a new strategy for fabricating high-efficiency integrated wavelength division devices on an optical monocrystalline platform.

Realization of High‐Performance Photoresponsivity of Sb2Se3‐Based Phototransistors by Using Hybrid Structure and Optimizing Annealing Temperature

“…[45] The responsivity and detectivity of ZSPT-200 are compared with those of Sb 2 Se 3 -based photodetectors previously reported by other groups as shown in Figure 7c. [46][47][48][49][50][51][52][53][54] It is worth noting that our ZSPT-200 exhibits the highest responsivity and relatively high detectivity compared to other Sb 2 Se 3 -based devices.…”

Femtosecond‐laser micromachining fork gratings in LN crystal with different mechanisms

“…[7][8][9] Besides, the FLDW technology can be applied in kinds of transparent materials, such as LiNbO 3 (LN), [10][11][12] polymer, 13 diamond, 14,15 yttrium aluminum garnet (YAG), 16,17 and so forth. So far, plenty of monolithic optical components have been achieved in the related materials, for example, beam splitter, 18 fiber Bragg grating, 19 vortex laser generator, 20 and wavelength demultiplexer, 21 which proves that the FLDW technology is a powerful tool for precise processing. As a widespread method to modify the properties of the materials, the mechanism behind the interaction between the laser pulses and the materials has been studied a lot.…”

Hybrid structure for vortex beam generation and propagation in LN crystal based on femtosecond laser direct writing

“…As the most significant functional crystalline material applied in various fields of optoelectronic industry, lithium niobate (LN) crystal is a chemically stable birefringent optical crystal with abundant nonlinear optical effects such as electrooptic, acousto-optic, piezoelectric, ferroelectric, [25][26][27] etc. LN crystal is a promising platform for fabricating in-chip photonic circuits.…”