Download GTU BE/B.Tech 2018 Winter 7th Sem New 2173904 Photonics Question Paper

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Subject Code: 2173904

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018

Subject Name: Photonics

Date: 29/11/2018

Time: 10:30 AM TO 01:00 PM

Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

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1. (a) Define Photobiology and give its application (MARKS 03)
2. (b) Explain the working mechanism of photoexcitation (MARKS 04)
3. (c) Explain how lasers interact with the Biomolecules, cells and tissues. (MARKS 07)

Q.2

1. (a) Define Plasmon and how they are generated (MARKS 03)

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2. (b) Define the following terminologies (MARKS 04)
   1. (1) Current density
   2. (2) Electromotive force
   3. (3) Motional EMF
3. (c) Classify the type of laser and give the application of laser in various fields (MARKS 07)

   OR

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4. (c) Write a note on manufacturing optical fibre. (MARKS 07)

Q.3

1. (a) What is E-k diagram what does it signifies? (MARKS 03)
2. (b) Give the various applications of the optoelectronic devices. (MARKS 04)

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3. (c) Write a note on working of LED’s (MARKS 07)

   OR

Q.3

1. (a) Explain the phenomena of the band to band and band to exciton phenomena occurring in electrons. (MARKS 03)
2. (b) Give the various applications of optoelectronic tweezers. (MARKS 04)

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3. (c) Explain the working of Laser diodes and Quantum Well Lasers. (MARKS 07)

Q.4

1. (a) Define photonic crystal and give its application. (MARKS 03)
2. (b) What is luminescence and explain any 4 types of luminescence (MARKS 04)
3. (c) Write a note on various methods developed to fabricate photonic crystals. (MARKS 07)

   OR

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Q.4

1. (a) Define Photovoltaic mode and photoconductive mode. (MARKS 03)
2. (b) Explain the working mechanism of Avalanche Photodiodes. (MARKS 04)
3. (c) Write a note on principle, working and application of OLED’s and Quantum dot LED. (MARKS 07)

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Q.5

1. (a) Enlist some of the commons near-field spectroscopy techniques and explain any two of them. (MARKS 03)
2. (b) Give the advantages and disadvantages of Phototransistor. (MARKS 04)
3. (c) Explain the principle and working of Near-Field Spectroscopy (MARKS 07)

   OR

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Q.5

1. (a) What is the difference between 3 leads and 2 leads phototransistor? (MARKS 03)
2. (b) Explain the process occurring in the basic operation of Charge couple device. (MARKS 04)
3. (c) Explain the phenomena of adiabatic nanofabrication and non-adiabatic nanofabrication of the devices. (MARKS 07)

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