Laser printer scanning system with a parabolic mirror

2015

SPIE Proceedings

We review a new type of dispersion elements based on a Bragg reflector waveguide, which provides a large angular dispersion of 1~2°/nm. The device functions as sub-wavelength virtually imaged phased array grating. We obtain a number of resolution-points (possible channel-count in demultiplexing) over 1,000. We demonstrate a large-scale wavelength switch based on a Bragg reflector waveguides array. The waveguides array has a small footprint of 2×4 mm 2 , but provides both ultra-large numbers (>100) of output-ports and wavelength-channels at the same time. Prospects for further increase in the wavelength channel count and output ports will be discussed.

Section: Introductionmentioning

confidence: 99%

Virtually image phased array based on Bragg reflector waveguide for large-port optical switching

2015

SPIE Proceedings

“…Beam-steering plays important roles in various application fields such as sensing, detecting and radar systems [1,2]. Conventional beam deflectors are normally mechanically controlled.…”

Section: Introductionmentioning

confidence: 99%

Output beam profile control of slow-light Bragg reflector waveguide deflector with high-contrast sub-wavelength grating

2014

SPIE Proceedings

ABSTRSACTWe demonstrated a super-high resolution beam scanner based on a Bragg reflector waveguide. In this device, radiation profile is wavelength-dependent. However, for specific applications, it is important to optimize the radiation direction. We propose a solution for this by introducing a high-contrast sub-wavelength grating (HCG). Numerical simulations using finite-difference time-domain method (FDTD) and rigorous coupled wave analysis (RCWA) were carried out. We found that, by designing the thickness, period and duty cycle of HCG, the output phase and intensity can be changed. As a result, it is possible to shift the output direction of the beam profile. We discussed their dependences on HCG parameters. On the other hand, the thicknesses (numbers of pairs) of the top-and bottom-distributed Bragg reflectors (DBRs) mirrors are influential to the results. A discussion on the thickness dependence was carried out. We found that, HCG has stronger influence to thinner mirrors. Because HCG can provide high reflectivity, thin mirrors are not a problem in such slow-light waveguides. We believe this proposal can offer us a method to obtain desirable output beam direction of Bragg reflector waveguides deflectors.

“…Optical beam deflectors/scanners have been key components for various fields such as sensing, imaging, free-space switching and so on [1,2]. A mechanical scanner with a rotated polygonal mirror has been widely used because of its high resolution performance.…”

Section: Introductionmentioning

confidence: 99%

Compact beam deflector based on slow-light Bragg reflector waveguide monolithically integrated with VCSEL

Shimada

Matsutani

IEICE Electron. Express

2013

Abstract:We demonstrate the monolithic integration of an electrothermal beam deflector based on a slow-light Bragg reflector waveguide with a VCSEL for the first time. The slow-light mode is laterally exited from a VCSEL and is directly coupled to the slowlight waveguide. The chip size is smaller than 300 μm. The fabrication process is the same as that of conventional VCSELs. Continuous electro-thermal beam steering of over 9ﾟ with a diffraction-limited divergence angle of 2.2ﾟ is obtained. In addition, a potential in compact and high-resolution on-chip beam deflectors is suggested.