| 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 |
| Download PDF |
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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) |
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| 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) |
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| Keyword(1) |
Slow light |
| Keyword(2) |
Bragg reflector waveguide |
| Keyword(3) |
Beam scanner |
| Keyword(4) |
Deflector |
| Keyword(5) |
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| Keyword(6) |
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| Keyword(7) |
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| Keyword(8) |
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| 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 |
| #Pages |
6 |
| Date of Issue |
2013-03-08 (IDY) |
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