Visible Laser on Silicon Optofluidic Microcavity

Abstract

Optical readout within microfluidic chips is a bottleneck limiting their industrial development. The integration of lasers operating in the visible range within a microfluidic platform is crucial for enabling in situ optical measurements in lab‐on‐a‐chip applications. In principle, microstructured single‐crystal silicon is an excellent optofluidic platform, which allows integration of microfluidic channels together with optical circuits including micro‐optics, waveguides, and resonant cavities. However, the silicon absorption below 1.1 µm is a fundamental limit that prohibits the use of silicon‐based microcavities as the feedback element for visible lasers and restricts their use to the infrared only. In this work, an ultra‐wide band silicon cavity enabled by two deeply etched hollow‐core planar waveguides is demonstrated. The proposed microcavity shows a broad bandwidth extending from 500 to 1600 nm with quality factors up to 2067. A tubular microfluidic channel is inserted between the mirrors of the optofluidic cavity. The microfluidic channel is filled with Rhodamine 6G (R6G) at 20 µL min−1 flow rate allowing successful demonstration of lasing on silicon at 562.4 nm. The laser beam propagates in‐plane (along the chip surface) and is handled with monolithically integrated input/output optical fiber grooves. This provides a unique silicon platform integrating hollow core optofluidic channels together with optical cavities, which is suitable for implementing optical readout in lab‐on‐a‐chip devices.

Thermodynamic Analysis of the Key Reactions in Synthesizing Inorganic Silicon Compounds or Products

“…Trichlorosilane (SiHCl 3 or TCS) and silicon tetrachloride (SiCl 4 or STC) are the basic raw materials for the preparation of high-purity silicon (hp-Si) (polysilicon and monocrystalline silicon) for solar cells, silicon wafer, optical fiber. , The hydrochlorination reaction of silicon is mainly used to produce TCS and STC. However, due to the side reactions, silicon hydrochlorination may produce TCS, STC, Dichlorosilane (SiH 2 Cl 2 or DCS), Monochlorotrihydrosilane (SiH 3 Cl or MCS), and SiH 4 .…”

Multi-scale modelling and experimental measurements of absorption enhancements of biological samples using HgTe colloidal QDs

“…Their interesting properties are mainly due to their small sizes and their associated quantum confinement effects and, thus, can be tuned by varying the size of the QDs [18], [19]. For this reason, they have found many applications in bioimaging [20], lightemitting diodes [21], [22], solar cells [23] and SEIRA [24]. The effect of quantum confinement in a material is pronounced when the size of the particle is in the order of the de Broglie wavelength of the electrons inside this material.…”

Visible nonlinear stimulated scatterings generated in a carbon disulfide filled microbubble cavity

“…In recent years, multi-wavelength visible lasers have had a wide range of applications from scientific research to technological applications [4] . Diverse laser media and nonlinear effects make it possible to generate multiple wavelengths simultaneously [5,6] . The discovery of multi-wavelength visible lasers in liquid-core fibers [7] , micro-ring cavities [8] , micro-tubular cavities [9] , micro-sphere cavities [10] , and other micro-resonant cavities have been reported.…”