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All-optical modulation of quantum st...

Chen, Gang.

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All-optical modulation of quantum structure/devices.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	All-optical modulation of quantum structure/devices./
作者:	Chen, Gang.
面頁冊數:	168 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: 6845.
Contained By:	Dissertation Abstracts International71-11B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3428847
ISBN:	9781124272474

All-optical modulation of quantum structure/devices.
Chen, Gang.

All-optical modulation of quantum structure/devices. - 168 p.

Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: 6845.

Thesis (Ph.D.)--Stevens Institute of Technology, 2010.

A new optical modulation approach for multi-band semiconductor devices and its application for laser modulation and imaging are presented. In accordance to numerical calculations, high-speed all-optical amplitude and frequency modulation of quantum cascade laser was achieved for the first experimentally. In addition numerical simulation of a novel high-resolution infrared imaging based on quantum dots offering a unique and inherent spectroscopic feature.

ISBN: 9781124272474Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

All-optical modulation of quantum structure/devices.
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245 1 0 $a All-optical modulation of quantum structure/devices.
300 $a 168 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: 6845.
500 $a Adviser: Rainer Martini.
502 $a Thesis (Ph.D.)--Stevens Institute of Technology, 2010.
520 $a A new optical modulation approach for multi-band semiconductor devices and its application for laser modulation and imaging are presented. In accordance to numerical calculations, high-speed all-optical amplitude and frequency modulation of quantum cascade laser was achieved for the first experimentally. In addition numerical simulation of a novel high-resolution infrared imaging based on quantum dots offering a unique and inherent spectroscopic feature.
520 $a Quantum cascade laser have a great potential in communication application due to their intrinsic ultrafast carrier relaxation time allowing modulation up to 100 GHz. However, electrical parasitic effects limit the available bandwidth to below 3 GHz for standard and 10 GHz for specially designed devices, respectively. To realize a parasitic-free modulation, an optical approach is proposed and implemented, using optical excitation of interband transition (in the near infrared spectrum) to control the intersubband lasing emission of a quantum cascade laser (in the middle to far-infrared spectrum). Although limited by the bandwidth of the detecting system circuitry, wavelength conversion and optical amplitude modulation up to 10.35 GHz is demonstrated experimentally, which is far beyond the 2 GHz allowed by quantum cascade laser circuitry. Besides the amplitude modulation, for the first time a 1.66 GHz optical frequency modulation is demonstrated in the emission wavelength of the quantum cascade laser, directly controlled by the near-infrared illumination. Furthermore, different forms of optical switching mechanisms are found in continuous-wave and pulse mode operation, respectively. This optical approach can be used for high-speed modulation, optical switching and wavelength conversion for free space communication.
520 $a Quantum wells- and quantum dot-based photodetectors are promising candidates for long wavelength radiation detection and imaging based on their high sensitivity. Imaging array with 1 megapixel resolution has recently been demonstrated in quantum well middle infrared photodetectors, yet requires cryogenic cooling for their operation. However, the realization of higher resolution is limited by a dark current and difficulties in corresponding readout circuit. In this work, a novel all-optical readout approach for infrared detection is proposed. It is based on the interaction between interband (visible-near infrared) radiation and intersubband (middle-far infrared) radiation via a three-level system in a quantum dot, utilizing the bottleneck effect caused long electron lifetime in the discrete energy level. Numerical simulation of GaAs/InGaAs quantum dots shows a strong dependency of the interband absorption at the presence of intersubband absorption. This property can be used to convert the middle to far infrared image into a visible-near infrared image, which can be acquired with a commercialized high resolution (up to 10 megapixels) visible-near infrared camera. As the specific conversion scheme allows for high resolution I-to-1 wavelength conversion it allows for direct spectroscopic analysis as well. Without dark current and complex circuitry, this middle-far infrared to visible-near infrared conversion strategy has the possible advantages of low noise, high resolution, and room temperature operation.
590 $a School code: 0733.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Optics. $3 1018756
690 $a 0544
690 $a 0752
710 2 $a Stevens Institute of Technology. $3 1019501
773 0 $t Dissertation Abstracts International $g 71-11B.
790 1 0 $a Martini, Rainer, $e advisor
790 $a 0733
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3428847