4500T303-1 - General Questions Great Fact Slab Waveguide...

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General Questions (15) Name ____________________ Great Fact (14) (Please Print) Slab Waveguide (18) Optical Resolution (15) Step Transmittance (18) Array of Apertures (20) E C E 4500 Third Hour Examination May 1, 2003 Rules for exam: 1. The time allowed is 60 minutes. The test will start at 2:50pm and end at 3:50pm. 2. Answer all questions. The value of each question is given in parentheses by the question. There are a total of 100 points possible. 3. All work must be shown for full credit. 4. Put your final answers in the locations specified. 5. You may use the six new single-sided 8 1/2" x 11" information sheets that you have prepared. You may also use the twelve single-sided information sheets that you prepared for the first and second examinations. 6. Some physical constants are given below. 7. You may use one "book of math tables." 8. You may use a "pocket calculator" that can be put in a normal-size pocket and requires no external electrical power. Graphing calculators and programmable calculators are acceptable. You may not use portable, lap-top, or notebook computers or wireless or network connections. 9. You may not use any reference materials other than those listed above. Therefore, you may not use the class notes, any textbooks, homework problems, reprints of papers, journals, prayer books, etc. 10. There is to be no sharing of anything. 11. If excess information is given in a question, ignore the unneeded information. 12. If too little information is given in a question, assume the information needed and clearly note this with your work. 13. Any changes to the examination will be written on the chalk board. Check the chalk board periodically during the examination. 14. Any acts of dishonesty will be referred to the Dean of Students without prior discussion. The official written Institute procedures on academic honesty (entitled "Maintaining Academic Honesty" and available from the Dean of Students Office) will be followed in all cases. 15. Have a happy exam! h = 6.6260755 × 10 -34 joule-sec c = 2.99792458 × 10 8 meter / sec e = 1.6021773349 × 10 -19 coul k = 1.38065812 × 10 -23 joule / K
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General Optical Engineering Questions 1. A symmetric slab waveguide has a flm oF reFractive index n f and cover and substrate oF reFractive index oF n c = n s . The thickness oF the flm is h o ra TM 0 mode excited in this waveguide at a Freespace wavelength oF λ , the thickness at cutoff For the 0 mode is (Circle one best answer.) a) 0 b) λ/n f c) λ/n s d) λ/n c e) ( n 2 f - n 2 c ) λ/ ( n 2 f - n 2 s ) F) ( n 4 f /n 4 c )( n 2 f - n 2 c ) λ/ ( n 2 f - n 2 s ) g) 2. An asymmetric slab waveguide has thickness h , cover index n c , flm index n f , and substrate index n s . Light oF Freespace wavelength λ is propagating in this waveguide as a 0 mode. This mode has evanescent tails in the cover and in the substrate. It is de- sired to make this 0 mode more tightly confned to the flm. How can this be done?
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This note was uploaded on 04/29/2008 for the course ECE 4500 taught by Professor Gaylord during the Spring '08 term at Georgia Institute of Technology.

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4500T303-1 - General Questions Great Fact Slab Waveguide...

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