Statement of Purpose_ Md. Mottaleb Hossain_MSE_UCR_Application Id: 100041910

Statement of Purpose Nanostructures and Devices, currently one of the most promising and challenging areas of research, is exactly what I am really passionate about and fortunately I have a background which I think makes me more suitable for this field. My career goal is to be an active researcher in the design, fabrication, and characterization of Nanostructured Devices. I also intend to involve myself with the cutting edge research activities either in academia or in industry towards developing new ideas and concepts in Nano-Devices. A PhD degree from Materials Science and Engineering (MSE) Department at University of California, Riverside, USA will be a key step forward towards achieving this goal. Here are some relevant works and accomplishments in support of my research and academic potential. I completed Bachelor of Science in Electrical and Electronic Engineering from Khulna University of Engineering and Technology (KUET)- one of the top ranked public engineering universities in Bangladesh. I placed among the top ten percent out of 116 undergraduate students in the class. I would like to add here that my senior year and major GPA were 3.93 and 3.72 respectively. During my senior year, discussions with Professor Dr. Ashraful Ghani Bhuiyan (E-mail: [email protected], Dean, Faculty of EEE, KUET) who is an expert in III-nitride semiconductor materials growth inspired me to explore the multifarious applications of semiconductor devices. I had the opportunity to work as an undergraduate research student in his research group. While working under his supervision, I realized that Optoelectronics is a great area of research with numerous open questions to solve and enrich this field. Staying in his research group, I also had the opportunities to discuss with graduate research students focused on a variety of photonic structures for both passive and active device applications, ranging from semiconductor light emitting diodes, lasers, photodetectors, solar cell, to name an important few. From literature review and my close observations in Dr. Ashraf’s research group activities on optoelectronics, I realized that laser performance improvements gained using quantum well in optoelectronic devices can be extended by adopting quantum wire and quantum dot (QD) heterostructures. Semiconductor devices based on quantum nanostructures were fascinating to me not only for studying fundamental physics but also to realize novel devices with unique properties. Very soon I was assigned to carry out my undergraduate thesis on 1.55 µm QD heterostructure Laser using InN as a promising candidate for the first time to be used in optical fiber communication. The thesis was entitled “Design of 1.55 µm Quantum Dot Heterostructure LASER using InN”. The outcome of my investigation was very interesting and revealed InN based QDL to be promising one for enhanced device performances. This research experience was invaluable for me because it helped me to get the essence of the theoretical research and I was fortunate to be a member of such a dynamic research group. In my graduation completion year, I participated in the IEEE Electron Devices Society Bangladesh Chapter Student Paper Contest 2009 where I contributed as an author by presenting my undergraduate thesis outcome. This manuscript was included in the top fifteen short listed distinguished papers from the whole country. Moreover, the structural analysis of 1.55 µm QDL was published in the Proceedings of the 2010 6th International Conference of MEMS, NANO & Smart Systems (ICMENS 2010), China. In the second review process, paper was selected by the specialists of the conference committee and recommended to the Advanced Materials Research Journal for publishing (in press).

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Statement of Purpose_ Md. Mottaleb Hossain_MSE_UCR_Application Id: 100041910

As a continuity of my work, I focused mainly on inhomogeneous line broadening, dependence of threshold current density on the RMS value of QD size fluctuations, cavity length, modal gain, and differential quantum efficiency for the proposed QDL structure. The outcome of my work titled “Proposal of high performance 1.55 µm quantum dot heterostructure laser using InN” has been accepted in the IEICE Transactions on Electronics, vol. E95-C, no. 2, pp. xxx-xxx, Japan (to be published in February, 2012). This theoretical work is the first demonstration of using InN QD in the semiconductor laser. I have also contributed some further works on vertical cavity surface emitting quantum well lasers (VCSEQWLs) outside of my research group. My contribution on the modeling and characterization of InGaAs based VCSEQWL was published in the International Journal of Engineering Science and Technology, January, 2011. Another paper involving performances analysis of In0.42Ga0.58As/In0.26Ga0.74As VCSEQWL on In0.31Ga0.69As ternary substrate was published in the International Journal of Electrical and Electronics Engineering, USA, March, 2011. I have not only gained valuable research experiences in the fields stated above, but also I have had the work on High Efficiency AlAs/GaAs/Ge Lattice Matched Multijunction Solar Cells and this research outcome was published in the Global Journal of Researches in Engineering, USA, July 2011. Besides doing active research works I had engaged myself in research promotional activities as a technical program committee member for many international conferences including IEEEI ICMLC 2011, IEEE ICCSIT 2011, and ASME ICCTD 2011. Currently, I’m serving as a registered reviewer of the Global Journal of Researches in Engineering, USA. Despite doing active research activities during this period, I had completed TOEFL and Revised GRE successfully as a part of graduate application to achieve my goal. Future is always unpredictable, so it’s really hard to say! But I have the confident to make it in my way. I always look at what is intellectually challenging, what are the major problems to be solved in the field of Nano-Devices. That’s why I intend to involve with graduate research activities toward my PhD’s in the relevant field. Later I would like to work in the area of research and development of Nano-Devices where I can make the greatest contribution utilizing my theoretical as well as practical background and creativity as an accomplished researcher. The research experiences and confidence earned from undergraduate level have strengthened my passion in doing advanced researches in this field. The distinguished faculty, exciting range of offered courses, and state of the art theoretical and experimental materials research facilities at different laboratories have attracted me to participate as a PhD student with the MSE Department at University of California, Riverside, USA. I am very much aware of Prof. Dr. Alexander Baladin’s research group activities in Nano-Device Laboratory since the senior year of my undergraduate study. Recently I have been in contact with him and he seems to be interested co-operating me on doing advanced research in the relevant fields. This really inspires and accelerates me towards MSE Department at UCR. I am confident that I would be able to conduct high quality research and add values to the cutting edge research environment of MSE Department if given the opportunity.

(Md. Mottaleb Hossain) 2

Personal History Statement_ Md. Mottaleb Hossain_MSE_UCR_Application Id: 100041910

Personal History Statement Born into an educated family, I was well-nurtured to be a self-motivated person thirsty for knowledge. My interest in engineering dates back to my senior years in high school (2000-2002) and college level (2002-2004) where I excelled both in physics and math and kept good academic records. Motivated by the strong desire for higher academic achievement, I decided to pursue a Bachelor degree. I took entrance exam at Khulna University of Engineering and Technology (KUET), Bangladesh and I selected Electrical and Electronic Engineering (EEE) because that was the application of a lot of physics to engineering devices. I like physics and I like Mathematics and that was a pretty straightforward choice. During my study at Notre Dame College, Dhaka- one of the best colleges in Bangladesh, I was involved with Notre Dame Nature Study Club (NDNSC) to circulate facts and knowledge about nature and natural resources among public as nature lovers and to propagate the spirit of nature conservation among them. I was also involved with college blood donation camp at regular intervals to provide for the necessary matters without any price to encourage blood donation in order to protect citizens' life and health by making condition of smooth supply and demand of blood through blood donation. During undergraduate level, I was exposed with the full range of physics, mathematics, and EEE courses, all of which tended to reinforce and solidify my intense interest in engineering. I also had the opportunity to study a number of humanities subjects which were both enjoyable and enlightening, providing me with a new and different perspective on the world in which we live. In the realm of engineering, I had developed a special interest on the semiconductor quantum dot laser technology when I got the opportunity to work with Professor Ashraf’s dynamic research group and carried out undergraduate thesis successfully. Besides academics, I engaged myself in various co-curricular activities of the department. I served the IEEE Student Branch, KUET as a coordinator. I was responsible for planning and running my Branch's program of activities for the year and providing a dependable bridge between the Student Branch and local Section. With the association of branch members I was able to carry out the activities successfully. I also served the EEE Department Student Organization as a Vice President to organize different cultural programs, sports, debates, and academic competitions: Science fair, Math Olympiad, and Physics Olympiad. I have fascination in Cricket. As a captain of the team, I participated in the “Inter School Cricket-2001 and 2002” and “Inter University Cricket-2007” which were held in Bangladesh. November 15, 2007, a day I will never forget, the super cyclone Sidr swept through the Upazila of Koyra at Khulna, Bangladesh. The damage was extensive, including tin shacks flattened, houses and schools blown away and enormous tree damage. After the storm, I contributed as a volunteer with our University Aid Team by supplying medicine, food, clothes, and relief supplies among the people of the hardest-hit areas. Moreover, I played a major role in organizing Technical Tour-2008 in various key point installations all over Bangladesh approved by the Department. Involvements with these co-curricular activities enhance my confidence level to a significant extent to face challenges with intellect in real life.

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Personal History Statement_ Md. Mottaleb Hossain_MSE_UCR_Application Id: 100041910

After successful completion of bachelor degree, I joined as a lecturer at the EEE Department of Stamford University Bangladesh, Dhaka on September 29, 2009. Here I’m responsible in taking theory and laboratory classes, conducting various research projects related to EEE, advising undergraduate students to undertake pioneering activities in EEE after completion Bachelor’s Degree. I am also involved with the journal publication committee of EEE Department, different academic committees, and co-curricular activities of this University. I would like to add here that I was a recipient of Junior (2000-2002) and Board Scholarships (2005-2009) for outstanding academic performances from the Government of the People’s Republic of Bangladesh. I was also the prize winner for many indoor and outdoor games at different levels of my education in Bangladesh. I was a past student member of IEEE and IEEE EDS. Now, I am an active member of many professional and learned societies: IEEE, IEEE EDS, IEEE Photonics Society, IEEE Communication Society, SPIE, IACSIT, and Institution of Engineers, Bangladesh (IEB) to keep myself updated with the state of the art research activities throughout the world. I am highly aware of the superb reputation of the Materials Science and Engineering (MSE) Graduate Program at University of California, Riverside, USA and my conversations with several of the current research students have served to deepen my interest in attending graduate studies with this Department. Moreover, this Department not only conducts cutting edge research activities but also gives a chance to meet people from different countries and different cultures and I have an inclination to know about other cultures and I have a history to have good adaptability in different environments. Due to my father’s job as a government employee I had passed my childhood in different places all over Bangladesh. I had to learn enjoying new environments, new friends and new places which have made me very accomplished at communicating with others, especially new people in new places. I think I am best suited to this program because I like to perform independent research activities and usually work best in group activities. I feel that with the comprehensive research facilities and competent faculty members supervising the students, MSE Department of University of California, Riverside is the ideal one for me to pursue graduate studies. This program fits with my future plan in every aspect I can imagine. I, therefore, look forward to joining this program as a PhD student.

(Md. Mottaleb Hossain)

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