MgF2 and SiO2 as low index material for antireflective coating?

24 March 2023 1 7K Report

We are using SiO2/TiO2 as materials for AR coating. Due to the limit from the tool, the TiO2 index is always lower than target.

I am wondering to switch to another low index material, MgF2 seems popular. What would be the advantages and disadvantages of switch from SiO2 to MgF2?

Thanks a lot.

Febin Cherian John

Switching from TiO2 to MgF2 as a low index material in AR coating can have both advantages and disadvantages. Here are some potential pros and cons to consider:

Advantages:

MgF2 has a lower refractive index than TiO2, which can help achieve the desired low index and improve the anti-reflective properties of the coating.

MgF2 has good optical properties in the visible range and is relatively easy to deposit using common deposition techniques such as thermal evaporation or electron beam deposition.

MgF2 is chemically stable and can withstand exposure to air, moisture, and moderate temperatures without significant degradation.

Disadvantages:

MgF2 has a lower hardness and mechanical strength than SiO2 and TiO2, which can make it more prone to damage or scratching during handling and use.

MgF2 has a lower thermal stability than SiO2 and TiO2, which can limit its use in high-temperature applications.

MgF2 has a relatively high refractive index dispersion, which can cause color aberrations and reduce the coating's performance in certain wavelength ranges.

Therefore, if you switch to MgF2 as a low index material, you may need to carefully consider the trade-offs between its optical, mechanical, and thermal properties and their impact on the final performance of the AR coating. It may also be worth exploring other low index materials such as Al2O3 or ZrO2, which have different trade-offs and can provide alternative solutions to your coating design challenges.

Badges
Science topic

More Jerry Liu's questions See All

How to use protein A G beads to purify antibody?

Secretory universal influenza antibody CR9114 were successfully expressed by adenovirus vector ,then we used protein A G beads purify CR9114.But the molecular weight of the purified antibody under...

22 February 2021 4,318 2 View

Amorphous silica XRD peak at around 10 degree?

21 February 2021 3,417 5 View

How could I get the P-value from the mean, SEM, and n of different groups in the t-test?

How could I get the P-value from the mean, SEM, and n of different groups in the t-test without the original data? For detail, I would like to know the P-value between BMP-2: 50ng/ml group and the...

06 February 2021 6,539 4 View

What mechanism is involved when chitosan is coated on magnetic nanoparticles?

Hello! I am currently working on coating of chitosan on magnetic Fe3O4 nanoparticles. I am wondering how this coating process happened? i.e. through what mechanism that chitosan can be coated on...

13 January 2021 5,657 5 View

What are the best paid maths journals?

Do they accept everything or they still pass them on a sieve?

12 January 2021 3,515 15 View

If The Star Sirius Was Described As Red In Historical Times, Why Is It White Now?

Several classical age writers described Sirius as red or reddish or more red than Mars, along with other red and orange stars that are still the same colors described in the past. Sirius has...

05 January 2021 1,080 2 View

Can Anything Pass From One Universe To Another?

Roger Penrose in the book Cycles Of Time requires all mass and energy to be converted to electromagnetic radiation. This is the sequential end of time in an old universe 3D not 4D and the setting...

02 January 2021 9,086 3 View

Does The Ending Of An Old Universe Cause The Beginning Of A New Universe?

Roger Penrose has promoted his book Cycles Of Time as an alternative view of Universe early beginnings. Along with other researchers he finds faint circles of temperature variations in the CMB...

02 January 2021 7,251 4 View

The impact of different poisson's ratios when analysising field vibration?

The Poisson's ratio of soil is quite difficult for us geo-engineers to obtain. I came across a problem when I tried to determine the parameters in a FEM model. For the saturated clay in...

02 January 2021 8,971 3 View

Is it possible to deposition a large area dielectric layer(mm scale) on the wet transferred graphene?

I want to deposition a dielectric layer on top of the CVD wet transferred graphene. The purpose of the dielectric layer is to uniformly cover the graphene and enable the top-gate modification of...

14 December 2020 7,693 2 View

What does Servant Leadership mean today and in the future? What are the advantages and disadvantages?

In current time of many changes in business and world of work, a lot is said and reported about the importance, skills and benefits of leadership. Are soft skills becoming more and more important?...

02 March 2021 8,149 3 View

Adherance of Polyaniline coating over stainless steel?

Is the electropolymerisation of polyaniline coating over stainless steel (SS) via Cyclic voltammetry technique is really adherant? Else how to improve the adhesion of the coating, whether any...

01 March 2021 8,220 2 View

Is there a method of determining feed digestibility without the need to re-pellet the feed?

I am aiming to determine the ADC values of a commercial fish feed, but I do not have a steam pelleter or extruder available to me. Ideally, the pellets could be coated with some inert marker....

28 February 2021 7,967 3 View

How to immerse bricks in wax ( for coating ) ?

Do we immerse the bricks horizontally or vertically ? #bricks#waterproofingsurface#civil#engeenering#chemicalengineering#wax#parafinwax

28 February 2021 6,685 2 View

For gelatin coating for culturing HUVEC.Should the gelatin be made in sterile water or PBS? Do I need to autoclave the gelatin soln after making it ?

I want to use 0.1% gelatin. Should that be made in PBS or sterile water? Should I autoclave the gelatin soln after making it in water/PBS?

28 February 2021 274 2 View

Why is my platinum counter electrode getting dirty during electrodeposition?

I am conducting anodic electrodeposition of MnO2 onto a stainless steel substrate, using a platinum strip as a counter electrode. This is done galvanostatically, with the current held between 5...

27 February 2021 1,829 3 View

What pH condition required to coat APTES on silica coated Fe3O4?

It's a hydrolysis reaction, which may produce by either acid or base-catalyzed reaction. so can anybody help me with this, which condition is suitable for this reaction?

26 February 2021 1,760 8 View

How can I assign a velocity along one direction to CO2 molecules in a molecular dynamics simulation using GROMACS?

Dear all, I am trying to perform a MD simulation about the interaction between CO2 and a polymer. I create my model, solvate it and perform the NVT and NPT equilibration. Now I am not able to...

26 February 2021 10,014 3 View

What is the best surface to culture cells isolated from a skin biopsy?

Hello, recently I am having some difficulties with maintaining the cell culture of primary cells isolated from a skin biopsy (normal and malignant). The coating of culture plates with Matrigel (a...

26 February 2021 6,151 2 View

Unknown debris sheets observed in cell culture flasks?

Hi, We culture neural progenitor cells in T175 culture flasks coated with PLO-Laminin. We have successfully grown these cells with our protocol for months. Recently, we observed large sheets...

25 February 2021 3,443 4 View