Fix luminescent

[joamatab]

Summary by Sourcery

Update installation instructions, move material definitions, and update waveguide bend examples.

New Features:

• Added support for 2.5D simulations using "approx_2D_mode".

Enhancements:

• Updated the file workflow description.

Tests:

• Updated waveguide bend tests to use new API and include 2.5D simulations.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the luminescent notebook with some improvements to the text, installation instructions, and code examples. It also updates the version number to v0.3-beta.

Sequence diagram for updated simulation workflow

sequenceDiagram
    participant User
    participant Python as Python Frontend
    participant Julia as Julia Backend
    participant FDTD as FDTD Solver

    User->>Python: Create component with gdsfactory
    Python->>Julia: make_pic_sim_prob()
    Julia->>FDTD: Configure simulation
    FDTD-->>Julia: Simulation setup complete
    Julia->>FDTD: solve()
    FDTD-->>Julia: Simulation results
    Julia-->>Python: Return results
    Python-->>User: Display results via load_res()

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File-Level Changes

Change	Details	Files
Updated the introductory text and added a link to the Colab notebook.	Updated version number to v0.3-beta. Added a maintenance message. Added a link to the Colab notebook for users who can't see output figures or table of contents. Removed beta version from v0.3	notebooks/luminescent.ipynb
Added a section on materials.	Added a new section explaining the materials used in the simulations. Explained that dispersive, anisotropic, and nonlinear materials are not simulated by default but can be implemented upon request. Updated the geometry layout section to remove the material information that is now in its own section	notebooks/luminescent.ipynb
Updated the installation instructions.	Clarified the installation instructions for Windows users. Added instructions for installing Julia on Linux. Added instructions for installing the FDTD package. Removed the old installation instructions. Added shell commands for pip install and Julia install	notebooks/luminescent.ipynb
Updated the file workflow section.	Simplified the explanation of the file workflow. Removed specific details about the working directory and run folders. Removed references to load_solution, write_sparams, and gcell_problem. Added references to load_res, and finetune	notebooks/luminescent.ipynb
Updated the waveguide bend tutorial.	Added import os Changed name to path. Added dtype="float32". Changed nres from 40 to 30. Updated the code to use make_pic_sim_prob and solve instead of write_sparams. Updated the code to use load_res instead of load_solution. Updated the expected loss value. Added a 2.5D approximation section. Updated the 2.5D approximation section to use approx_2D_mode="TE" instead of N=2. Updated the 1.5um radius example to use the new API calls. Updated the wavelength range example to use the new API calls	notebooks/luminescent.ipynb
Updated the customizing materials, layers, and modes section.	Removed the code example. Commented out the code example. Removed materials from the default parameters	notebooks/luminescent.ipynb
Updated the mode converter tutorial.	Added recommended RAM. Changed name to path. Updated the code to use make_pic_inv_prob, solve, and load_res. Added N=2 to gcell_problem. Added stoploss=0.05 to gcell_problem. Added approx_2D_mode="TE" to make_pic_inv_prob. Removed finetune example. Updated the code to load the solution using load_res	notebooks/luminescent.ipynb
Updated the 1x2 splitter MMI tutorial.	Added import os Changed name to path. Updated the code to use make_pic_inv_prob, solve, and load_res. Added approx_2D_mode="TE" to make_pic_inv_prob	notebooks/luminescent.ipynb
Updated the 1x4 splitter MMI tutorial.	Removed the empty code cell. Commented out the finetune and load_solution calls. Changed load_solution to load_res	notebooks/luminescent.ipynb
Updated the wavelength domain demultiplexer tutorial.	Reduced RAM requirement from 32G to 20G. Changed name to path. Updated the code to use make_pic_inv_prob, solve, and load_res. Commented out the entire code example	notebooks/luminescent.ipynb
Updated the symmetric crossing tutorial.	Added from pprint import pprint. Changed name to path. Updated the code to use make_pic_inv_prob, solve, and load_res. Commented out the entire code example	notebooks/luminescent.ipynb

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[joamatab]

@paulxshen

this PR has more fixes but still doesn't work

[paulxshen]

@joamatab Thanks I'll move the shell install script from notebook to proper place. BTW does your test server have a GPU?