Dpo3034

The polymeric matrix is composed of 1,6-hexanediol diacrylate (HDDA) and photoinitiator (1173), and the monomer concentration of photoinitiator was fixed 0.2%. The PS particles (5 μm in diameter, purchased from Tianjin Saierqun Technology Co., Ltd.) were dispersed in deionized water. After the water was completely evaporated at 60 °C, the polymeric matrix was added to the reagent bottle containing PS particles, and ultrasonic vibration was carried out for 2 hours at room temperature to obtain a uniformly dispersed PS particles solution. After that, the solution was rapidly injected into the sealed chamber device. A sinusoidal AC signal (5 MHz, 20 Vpp), generated by a waveform generator (Unit UTG2062A), was applied to electrodes lines to create a non-uniform electric field. A digital phosphor oscilloscope (Tektronix DPO 3034) was used to confirm the generated waveform. The viscometer SCYN1301 was used to measure the kinematic viscosity of the solution. The DEP-induced behavior of the microparticles was observed using an optical microscope (IX71, Olympus Co., Japan) equipped with a digital CCD camera and a computer screen.

The detector chip was mounted in a ceramic LCC. Ultrasonically extruded, gold wires connected the gold contact pads on the chip to the LCC leads. The LCC was then mounted in a custom-designed, printed circuit board (PCB). For responsivity measurements, the detector was illuminated with a cavity blackbody radiator (Santa Barbara Infrared Inc.) at 1000 °C equipped with a mechanical chopper. The PCB was connected by way of triaxial cables to a low-noise current preamplifier (SR570, Stanford Research Systems) and lock-in amplifier (SR830, Stanford Research Systems). Data acquisition was computer-controlled using a custom written program. A Spectra-Physics Solstice femtosecond laser (1-kHz repetition rate, 90 fs pulse width, 800 nm) was used to pump a TOPAS optical parametric amplifier to produce a wavelength of 1550 nm with a pulse width of 150 fs and a repetition rate of 1 kHz. A pair of linear polarizers was used to control the laser power. The photocurrent was routed by way of triaxial cables to an SR570 current preamplifier and voltage amplifier (SR560, Stanford Research Systems) and then finally to a 300 MHz digitizing oscilloscope (Tektronix DPO3034). Electrical phase angle measurements were made using an Agilent E4980 LCR meter.