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Paper Abstract and Keywords
Presentation 2013-03-15 16:15
[Invited Talk] High-resolution beam scanner based on slow-light waveguides
Fumio Koyama, Xiadong Gu (Tokyo Tech)
Abstract (in Japanese) (See Japanese page) 
(in English) Beam-steering has been a key function for various sensing and imaging applications, such as projection displays, laser printers and LIDAR (Light Detection And Ranging) systems. Mechanical beam steering devices such as polygonal mirror scanners have been widely used because of their wide deflection angle operations with high-resolutions. However, they are bulky and their beam-steering speed is limited because of their moving parts. A non-mechanical beam steering approach is useful for various applications where the beam direction changes rapidly to random locations or when a system needs to be compact with good mechanical stabilities. Various approaches for non-mechanical beam steering have been reported, which include an optical phased array, a liquid crystal phase modulator, an electro-optic crystal deflector, an in-plane laser array, a photonic crystal laser, a phase-locked VCSEL and so on. The beam steering performance can be figured by a number of resolution-points N, which is defined as distinguishable spot counts in far-field patterns. The N for mechanical deflectors can be larger than 1,000 for practical application. It has been difficult to get a number of resolution points over 100 for non-mechanical beam steering techniques. An optical phased-array has been an interesting approach for realizing high-resolution beam steering. The recent Si-photonics approach enables compact 2D beam scanners. However, it has been difficult in increasing the inter-elements in the array for increasing N and there is a limitation in free spectrum range (FSR) of operating wavelengths. Therefore, there is a strong demand for compact and high-resolution beam-steering device which can exhibit a large beam steering angle and a small divergence angle at the same time.
We proposed a high-resolution beam steering device based on a slow-light Bragg waveguide. In this paper, we present the structure, the operating principle and the beam steering characteristics of beam steering devices composed of a Bragg reflector waveguide in a passive or active fashion. We realize a beam steering angle over 60° and a number of resolution-points over 1,000, which is the record data in non-mechanical beam steering devices. In addition, we discuss some future prospects of on-chip integration with a VCSEL and 2D beam scanners.
Keyword (in Japanese) (See Japanese page) 
(in English) Slow light / Bragg reflector waveguide / Beam scanner / Deflector / / / /  
Reference Info. ITE Tech. Rep., vol. 37, no. 16, IDY2013-21, pp. 33-38, March 2013.
Paper # IDY2013-21 
Date of Issue 2013-03-08 (IDY) 
ISSN Print edition: ISSN 1342-6893
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Conference Information
Committee IDY  
Conference Date 2013-03-15 - 2013-03-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IDY 
Conference Code 2013-03-IDY 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) High-resolution beam scanner based on slow-light waveguides 
Sub Title (in English)  
Keyword(1) Slow light  
Keyword(2) Bragg reflector waveguide  
Keyword(3) Beam scanner  
Keyword(4) Deflector  
1st Author's Name Fumio Koyama  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Xiadong Gu  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2013-03-15 16:15:00 
Presentation Time 35 minutes 
Registration for IDY 
Paper # IDY2013-21 
Volume (vol) vol.37 
Number (no) no.16 
Page pp.33-38 
Date of Issue 2013-03-08 (IDY) 

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