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

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2173904 Photonics Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2173904 Date: 29/11/2018

Subject Name: Photonics

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define Photobiology and give its application 03
(b) Explain the working mechanism of photoexcitation 04
(c) Explain how lasers interact with the Biomolecules, cells and tissues. 07
Q.2 (a) Define Plasmon and how they are generated 03
(b) Define the following terminologies
(1) Current density
(2) Electromotive force
(3) Motional EMF
04
(c) Classify the type of laser and give the application of laser in various
fields
07
OR
(c) Write a note on manufacturing optical fibre. 07
Q.3 (a) What is E-k diagram what does it signifies? 03
(b) Give the various applications of the optoelectronic devices. 04
(c) Write a note on working of LED?s 07
OR
Q.3 (a) Explain the phenomena of the band to band and band to exciton
phenomena occurring in electrons.
03
(b) Give the various applications of optoelectronic tweezers. 04
(c) Explain the working of Laser diodes and Quantum Well Lasers. 07
Q.4 (a) Define photonic crystal and give its application. 03
(b) What is luminescence and explain any 4 types of luminescence, 04
(c) Write a note on various methods developed to fabricate photonic crystals. 07
OR
Q.4 (a) Define Photovoltaic mode and photoconductive mode. 03
(b) Explain the working mechanism of Avalanche Photodiodes. 04
(c) Write a note on principle, working and application of OLED?s and
Quantum dot LED.
07
Q.5 (a) Enlist some of the commons near-field spectroscopy techniques and
explain any two of them.
03
(b) Give the advantages and disadvantages of Phototransistor. 04
(c) Explain the principle and working of Near-Field Spectroscopy 07
OR

Q.5 (a) What is the difference between 3 leads and 2 leads phototransistor? 03
(b) Explain the process occurring in the basic operation of Charge couple
device.
04
(c) Explain the phenomena of adiabatic nanofabrication and non-adiabatic
nanofabrication of the devices.
07
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