Multilayer Fabrication of a Rainbow of Microdisk Laser Particles Across a 500 nm Bandwidth

Abstract

Laser particles are an emerging technology with unique stimulated emission properties. The ability to produce laser particles over a wide spectral range is critical for massive wavelength-division multiplexing. Here we show a novel method to fabricate semiconductor microdisk laser particles with emission wavelengths spanning 500 nm from a single epitaxial wafer. The wafer consists of nine gain layers of InGaAsP with different quaternary compositions to cover lasing wavelengths from 1150 to 1650 nm. With optical pumping at 1064 nm, these particles are then used to track the movements of thousands of individual cells in vitro.

Laser particle activated cell sorting in microfluidics

“…We used 9 different compositions of In 1− x Ga x As y P 1− y ranging from ( x = 0.26, y = 0.55) to ( x = 0.44, y = 0.95) to produce LPs over 1150 nm to 1650 nm. 14 …”

“…These parameters were chosen to ensure reliable LP detection across the entire wavelength bandwidth based on our previous threshold and lasing measurements. 14 The optical emission from the pumping zone was directed into a home-built grating-based spectrometer (resolution 0.5–1.0 nm) equipped with a 2048-pixel InGaAs linear camera typically operated at a speed of approximately 25 000 lines per s. The flow rate was set to approximately 40 μL min −1 , corresponding to a mean flow speed of ∼0.5 m s −1 within the flow channel. Given the parabolic profile of laminar flow, cells travelled at slightly different speeds depending on their location in the channel.…”

“…We used 9 different compositions of In 1−x Ga x As y P 1−y ranging from (x = 0.26, y = 0.55) to (x = 0.44, y = 0.95) to produce LPs over 1150 nm to 1650 nm. 14 To demonstrate the concept of an LP-based flow reader, we first built a straight 1 cm-long channel (width x depth = 50 μm × 25 μm) microfluidic chip constructed using standard polydimethylsiloxane (PDMS)-on-glass technology. The microfluidic chip was positioned atop a microscope stage, with a 1064 nm pulsed pump laser (40 mW, 10 ns pulse width, 2 MHz repetition rate) focused within the channel center.…”

Nanogap Enabled Trajectory Splitting and 3D Optical Coupling in Self-Assembled Microtubular Cavities

“…Optical microcavities guiding resonant light along a ring trajectory (i.e., the path of resonant light) in carefully designed geometries form whispering-gallery-mode (WGM) resonances by self-interferences and have been employed as a versatile photonic structure for many applications in lasing, nonlinear optics, and light–matter interactions. − To further explore the manipulation of resonant light, optically coupled WGM microcavities with hybridized resonant trajectories were explored to tune the resonant eigenfrequency and the spatial distribution of the resonant modes, indicating a variety of nontrivial physical phenomena and practical applications ranging from mode-selective lasing to non-Hermitian photonics. − In these coupling systems, the microcavity geometries ( i.e. , microtoroids, , microdisks, − microrings, − or microspheres , ) and the intercavity coupling gap play important roles to ensure sufficient spectral match and efficient coupling.…”

Microcavity- and Microlaser-Based Optical Barcoding: A Review of Encoding Techniques and Applications

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