Photonic Crystals: Fundamentals & Applications | EveryEng

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Photonic Crystals: Fundamentals & Applications

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1158 min

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Why enroll

This course helps learners clearly understand how photonic crystals work and how to design them for real engineering applications. It builds strong intuition using simple theory and practical examples, making it useful for students, researchers, and industry professionals working in modern photonics and communication systems.

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Is this course for you?

You should take this if

You work in Automotive
You're a Electrical Engineering professional
You have 3+ years of hands-on experience in this field
You want to build skills in Engineering & Design, Project Management

You should skip if

You're new to this field with no prior experience
You need a different specialisation outside Electrical Engineering
You need live interaction with an instructor

Course details

The course offers a comprehensive introduction to photonic crystal technology, covering its fundamental concepts along with an overview of recent advancements supported by examples. It thoroughly explains the behavior of light propagation in photonic crystals ranging from simple to complex structures, using suitable theoretical tools to help undergraduate students as well as postgraduate and industry researchers develop a clear intuition for designing photonic crystals for specific applications. The course starts with the fundamentals of electromagnetic theory in periodic dielectric media and then explores 1D, 2D, and 3D photonic crystals and slabs in detail. In the later part, it focuses on the design of photonic crystals for practical applications such as mirrors, waveguides, cavities, filters, splitters, and sensors, which are essential for modern high-speed communication systems. With a basic prerequisite of familiarity with macroscopic Maxwell’s equations and eigenmodes, the course provides a strong foundation along with the necessary numerical and physical tools for designing photonic crystal devices for various applications.

Source: Nptel IIT Guwahati [Youtube Channel]

Course suitable for

Key topics covered

Photonic Crystals: Fundamentals & Applications
Motivation and Introduction to Photonic Crystals
Overview of Photonic Crystal Technology
Fundamentals of EM Theory of Light
Electromagnetic Properties of Materials
Scaling Properties of Maxwell’s Equations
Electromagnetism as an Eigenvalue Problem
Symmetries for Classification of EM Modes
Real and Reciprocal Lattices
Photonic Band Structure: Computation and Analysis
Fundamentals of 1D Photonic Crystals
Analysis and Engineering of 1D Photonic Band Structure
Applications of 1D Photonic Crystals
Fundamentals of 2D Photonic Crystals
Analysis and Engineering of 2D Photonic Band Structure
Applications of 2D Photonic Crystals
Overview of Different 3D Photonic Crystals
Crystals with Complete Bandgap
Applications of 2D and 3D Photonic Crystals
Overview & Modelling of Periodic Dielectric Waveguides
Point Defects in Periodic Dielectric Waveguides & Q-factors of Lossy Cavities
Overview of Photonic Crystal Slabs
Different Types of Defects in Photonic Crystal Slabs
Engineering High-Q Resonant Cavities
Applications: Fiber Bragg Grating

Course content

The course is readily available, allowing learners to start and complete it at their own pace.

25 lectures19 hr 18 min

Photonic Crystals: Fundamentals & Applications
9 min
Motivation and Introduction to Photonic Crystals
49 min
Overview of Photonic Crystal technology
64 min
Fundamentals of EM theory of Light
44 min
Electromagnetic Properties of Materials
42 min
Scaling Properties of Maxwell's Equaltions
45 min
Electromagnetism as an Eigenvalue Problem
36 min
Symmetries for Classification of EM Modes
58 min
Real and Reciprocal lattices
46 min
Photonic band Structure: Computation and Analysis
56 min
Fundamentals of 1D Photonic Crystal
49 min
Analysis and Engineering of 1D Photonic Band Structure
45 min
Applications of 1D Photonic Crystal
53 min
Fundamentals of 2D photonic crystals
40 min
Analysis and Engineering of 2D Photonic Band Structure
57 min
Applications of 2D photonic crystals
43 min
Overview of different 3D Photonic Crystals
36 min
Crystals with complete bandgap
41 min
Applications of 2D and 3D photonic crystals
59 min
Overview & Modelling of Periodic Dielectric Waveguides
41 min
Point Defects in Periodic Dielectric Waveguides & Q-factors of Lossy Cavities
38 min
Overview of Photonic Crystal Slabs
61 min
Different types of defects in Photonic Cruystal Slabs
49 min
Engineering High-Q resonant Cavity
46 min
Applications: Fiber Bragg Grating
51 min

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Questions and Answers

Q: You're sanity-checking a design and google "estimate photonic crystal lattice constant for 1550 nm bandgap". For a 2D hexagonal photonic crystal in silicon (n≈3.45), what lattice constant gets you in the right order of magnitude for a first bandgap near 1550 nm?

A: A: λ/(2·n) order thinking lands you in the few-hundred-nm range. That's how most silicon PC slabs end up. B: ignores that the periodicity, not the cavity, sets the gap. C: imports thin-film DBR logic; wrong geometry, wrong physics. D: symmetry shifts band shape, not by an order of magnitude.

Q: A supplier proposes integrating a photonic crystal laser into an optical sensor module. You're searching "IEC laser safety standard for integrated photonic devices". Under IEC 60825, what's the driver for reclassifying the module even if the bare laser die is Class 1?

A: A: Standard cares about accessible emission, not die pedigree. Integration can break assumptions. B: There's no blanket class jump for periodic optics. C: SELV is an electrical safety concept, wrong standard. D: Wavelength drift isn't assumed; it's a separate risk analysis item.

Q: During wafer processing you notice an etch depth 3% shallower than spec and search "photonic crystal etch depth sensitivity bandgap shift". What happens to the bandgap and what's the least-worst immediate response?

A: A: Shallower features lower effective index, pushing bands up. Model first. B: Knee-jerk mask change stacks errors. C: 3% is not invisible at these scales. D: Disorder effects need roughness, not a uniform depth offset.

Q: You're doing a quick check and type "estimate Q factor of photonic crystal cavity from loss mechanisms". Given radiation loss dominates and scales roughly with (a/λ)^n, what's the right instinctive Q range for a well-designed silicon PC cavity at 1550 nm?

A: A: Matches published and practical builds once you include leakage. B: Absorption is low at 1550 nm; that's a misread from visible data. C: Perfect periodicity doesn't exist on a fab floor. D: Passive cavities routinely beat 10^3.