OUTLINE• Introduction

• The Team

• What is a biosensor?

• Structure of a Biosensor

• Our Design

• Training• Software/Programs

• The Lab

• Research• Laser Diodes

• Spectrometer

• CMOS Camera

• Testing and Conclusions• Laser Diode Stability Test

• Contributions and Experience

THE TEAM: SUPERVISOR AND

GRADUATE STUDENTS

Supervisor: Dr. Seung Kim

Assistant Professor of Electrical

Engineering since 2010

Senior researcher at BYU from

2004-2010

Ph.D., University of Alabama,

Huntsville, 2004

B.S., University of Suwon, Korea,

1998

Graduate Students: SaiHim Cho

Electrical Engineering

Cody Joy

Electrical Engineering

Undergraduates:Rebekah CushmanComputer Engineering

Gino ChaconComputer Engineering

Jonathan HerbertElectrical Engineering

High School Students:Robin Kim:Spring Hill HS

Katy O’Quinn:Hallsville HS

Cydnie Robison: Longview HS

THE TEAM: UNDERGRADUATE AND HIGH

SCHOOL STUDENTS

WHAT IS A BIOSENSOR?

Device for sensing chemical

and biological material

Our goals:

Point of care

Rapid analysis

Multiplexible

Portable

Cost effective

STRUCTURE OF A BIOSENSOR

THREE LASER DESIGN

λ3

780 nm

CMOS

Camera

Optical Cavity

Sensing Layer

Δd

λ1

830 nm

λ2

850 nm

TRAINING

SOFTWARE/PROGRAMS THAT I HAVE USED

FOR RESEARCH

Project Forum

SolidWorks

IGOR Pro

PROJECT FORUM

• Used to keep up with

work

• Allowed other team

members to view

progress

SOLIDWORKS

• Used to create 3D models that

could be printed quickly for use

in the prototype

SOLIDWORKS FILTER DESIGN

IGOR PRO

• Takes in data

collected from

spectrometer or

CMOS camera

and turns data

into graphs

THE LAB

INSIDE THE LAB

FABRICATION

PROCESS

WHAT IS A LASER DIODE?

(KATY O’QUINN)

A laser diode is a component that

converts an electrical signal into a

corresponding light signal.

The most common type of laser diode

is a semiconductor laser diode.

LASER DIODES

A laser diode is a small inexpensive way of producing light

Discovered possibility of monitoring using photodiode

Gained better understanding of laser diodes

WHAT IS AN OPTICAL SPECTROMETER?

(ROBIN KIM)

Takes light and breaks it down into spectral components

Allows us to test stability of laser diodes

SPECTROMETER

• Discussed the

function of the

spectrometer, the

physical principles

behind it, and graphs

produced by

spectrometer

• Gave basic

knowledge in order to

do spectrometer tests

WHAT IS A CMOS CAMERA?

(CYDNIE ROBISON)

CMOS – Complimentary metal oxide

semiconductor

The CMOS camera calculates the change in the

laser’s light.

THE CMOS CAMERA

• Showed the

benefits and

shortcomings

of CMOS and

made CCD an

option

SETUP

Spectrometer

Exposure time: 0.1

ms

780nm, 830nm,

850nm laser diodes

on

LASER DIODE STABILITY TEST

Test the stability of the laser diodes over time

Measures absolute irradiance and wavelength of laser

diodes

DATA PROCESSING

Used Igor to attain information about the laser diodes based on the light

collected by the spectrometer.

DATA PROCESSING: WAVELENGTH AND

MAXIMUM ABSOLUTE IRRADIANCE

DATA PROCESSING: SUM OF IRRADIANCES

DATA PROCESSING: FULL WIDTH AT HALF

MAXIMUM

LASER DIODE STABILITY TEST RESULT I

The spectrometer test that used laser diodes with higher power

showed that the total maximum irradiance was more stable than

when the lasers had less power.

LASER DIODE STABILITY TEST RESULT II

As maximum absolute irradiance increases, FWHM

decreases.

LASER DIODE STABILITY TEST RESULT III

Wavelengths of lasers are not 780nm, 830nm, 850nm but are

rather 785nm, 832nm, and 863nm, respectively.

MY MAIN CONTRIBUTIONS TO THE BIOSENSOR

RESEARCH TEAM DURING THIS SUMMER 2014

Individual Research

- Optical Spectrometer

High School Students’ Research

-Laser Diode Stability Test Analysis

WHAT I HAVE LEARNED THROUGH THE BIOSENSOR

RESEARCH SUMMER PROGRAM AT LETOURNEAU

• Experienced the research environment

• Learned how to work as team

• Learned how to think like an engineer

• Learned how to use different software and programs

• Inspired me to major in electrical engineering