Team Desu

Basudde KajubiJason TalbotEkene UzomaSerge Zhilyaev

Background and Motivation

• Evolution in laser technology

- The available bandwidth has increased. - Output wavelength can be tuned

• New shutter technology needed

- System to block range of wavelengths.

• Infrared modulator

- IR modulator less developed- High spec in open transmission

Background and Motivation

• Modulator using oxide shutter

- Vanadium oxide is implemented

- Thermochromic property

• Open/Closed mode operations

- Open mode transmittance is high

- Closed mode reflectance occurs

The Design• Deposit oxide on glass panel by

sol-gel method

• Design a micro heater attached to glass

• Add photodetector for display

• Implement testing system for shutter characterization

Sol Gel Process

• Melt VO2 at 600C

• Pour it in water

• Spin it 3-5 times

The higher the speed, the lower the thickness

• Fire film at 500C for about 2 hours

• 15g per 500ml of distilled water

Derivation of Design Algorithm

• Goal?

• Power Calculation

• Energy (heat calculation)

• Relationship between heat and power

• Resistance, Resistivity, length, Area?

• Current Density requirements

Actual Design

• Reason For Design

• Restrictions on Design

• Possible Improvements

Photodetector and LED

• 3.4um LED

• Why PbSe?

• Are they compatible?

Deliverables of the Design Project

• Produce optical shutter designed for 3-5um

• Characterize the shutter for optical performance and switching time.

• Evaluation of measurements would give guidelines development of the shutter in a real system.

• Laser protection should have 50-70 % open transmission and less than 1 % closed transmission

• The switching time from open to closed mode on the order of µs-ms.  

Design Alternative

• Implementing modulator as real system

• Can be used as data storage

• Window coating application

• Military applications

MDR specifications

• Make experimental thin films by depositing VO2 using the sol gel method

• Configure a method for making heating appliance

• Derive values and specifications for heating process

• Experiment on the laser and photo detector settings

• Look into making the project more efficient

• Conduct tests on shutter characterization

QUESTIONS AND COMMENTS