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Example:Index-fitting for material without protect layer

Tutorial: Refractive-Index Fit for a Single Transparent Layer (No Protective Layer)​

This is a step-by-step practical tutorial. Follow each numbered step carefully.

Goal: Recover the refractive index and physical thickness of a single transparent film (e.g. SiNx) from a measured spectrum.

Step 1 — Start the module and load a template​

Open the refractive-index fitting module (see Quick Start) and create a new fitting tab. Instead of setting every parameter manually, load a saved template:

  1. Open the right-side global action drawer.
  2. Click Download Refractive Index Fit Config.
  3. Choose the record s001 or a template entry and click OK to load base constants (air index, substrate index, etc.).

Step 2 — Load measured spectrum​

  1. In the right-side drawer click Import Spectrum (usually the 4th icon).
  2. Switch to the Manual tab in the import dialog.
  3. Set Import To (select relevant spectrum types) and Source → Spectrum Database: Measurement.
  4. Click Import Spectrum to open the database browser.
  5. For this example, select glass ID 500100 and target coordinate 150, then click OK.

The measured curve should now appear on the main chart.

Index-Fit with load spectrum

Step 3 — Create a spectrum target​

  1. In the right-side drawer open Spectrum Target and click Generate Spectrum Target.
  2. Ensure Use Spectrum is checked and add the imported spectrum using the + menu.
  3. Keep defaults and click the large + to generate the target queue.
  4. Click OK to save and apply the target.
注意

Make sure the final "Use" checkbox for the target row is checked; otherwise the target will be ignored.

Step 4 — Set model and parameter ranges​

  1. Set No protective layer mode (protective-layer toggle should be inactive).
  2. Define thickness search range: start 20 nm, end 50 nm, step 1 nm.
  3. Provide an initial guess for n (e.g. 2.1) and an offset (0.1).
  4. Define stop criteria: merit threshold MF = 10, max attempts = 100.
  5. Select the Filmstar solver for this basic single-layer fit.

Fit-Option

Step 5 — Run and apply results​

  1. Click the Optimize (Play) button to start fitting.
  2. Track optimization progress in the dynamic panel.
  3. When finished, open Fit Results (History) and click Load for the latest entry.
  4. The fitted layer table will show computed thickness (e.g. 21 nm).
提示

To share results, use the right-arrow on the fitted layer to open the details table, then upload to the database or copy to Excel via right-click.